Probotector's starting weapon. Fires blade-shaped projectiles in the direction of movement with every second projectile aimed backward, evolves into Time Warp with Weapon Power-Up plus Wings, and has a 5% Luck-scaled freeze chance.
Prism Lass is one of only a handful of weapons in v1.13 that fires based on movement direction rather than facing direction.
The wiki effects block describes the firing pattern directly: blade-shaped projectiles thrown in the direction the player is moving (or last moved). Every second projectile fires in the opposite direction the player is facing, which means a Prism Lass cast covers both forward and backward arcs simultaneously without needing to turn.
That bidirectional pattern solves a positioning problem that plagues most Operation Guns DLC weapons. Long Gun and Short Gun both fire forward only, which forces the player to constantly reposition. Prism Lass handles the back arc automatically, letting the player focus on movement rather than aiming.
The weapon also has a freeze mechanic baked into its level 1 effects. Every projectile has a 5% chance to freeze enemies on hit, and the freeze chance scales with Luck. Combined with Probotector's Armor-to-Might passive conversion, Prism Lass is the only Operation Guns weapon where Clover (a Luck-stacking passive) becomes a build-defining pick rather than a niche utility choice.
Prism Lass by surviving 15 minutes with Probotector. To play as Probotector, find 7 Barriers and purchase him for 500 gold
Time Warp at max level (level 8) plus max-level 
Weapon Power-Up AND 
Wings (both required)
Probotector, who gains +10% Might per +1 Armor (no cap mentioned in wiki)Prism Lass is classified as a Normal weapon in the Operation Guns DLC with internal ID `FB_PRISMCUTLASS`. The "Cutlass" portion of the ID telegraphs the actual weapon type: a blade, despite the cosmetic appearance reading more like a prism. The wiki effects block describes the firing pattern: blade-shaped projectiles fired in the direction the player is moving or last moved, with Amount controlling how many projectiles fire at once.
The bidirectional firing pattern is the trait that separates Prism Lass from every other Operation Guns weapon. According to the wiki, "every second projectile being fired in the opposite direction that the player is facing." That means a 2-projectile cast covers both directions, a 4-projectile cast covers both directions twice, and so on. In practice, this turns Prism Lass into a 360-degree adjacent weapon when projectile count is high enough.
On Probotector specifically, the projectiles render with a blue-tinted version of his melee attack animation. On other characters running Prism Lass through level-up offers, the projectiles render as plain blue blades. The cosmetic detail confirms the weapon was designed Probotector-first, with general roster compatibility added on top.
Most projectile weapons fire in the direction the character is facing, which means standing still still produces casts in a fixed direction. Prism Lass fires in the direction of movement, which means standing still doesn't change firing direction (it uses last-moved direction). After a few runs, the practical impact becomes clear: Prism Lass rewards committed directional movement rather than circle-strafing. Walking in a clear line into waves keeps the firing direction predictable, while erratic movement scatters projectiles.
In our testing, walk in straight lines through enemy clusters rather than circling them. Probotector's tanky base stats (+100 Max Health, +1 Armor) let you eat trash damage during straight-line movement, and the bidirectional Prism Lass cast catches enemies on both sides of the line. Circle-strafing wastes the back-arc projectiles on empty space.
Prism Lass has 8 levels. The wiki's level table mixes Damage, Cooldown, Area, and Speed bonuses across the scaling, with a single Amount pick at level 2:
| Level | Bonus |
|---|---|
| Level 1 | Has a small chance to freeze enemies (5% base, Luck-scaled) |
| Level 2 | Fires 1 more projectile |
| Level 3 | Base damage up by 5 |
| Level 4 | Cooldown reduced by 0.5 seconds |
| Level 5 | Base damage up by 5 |
| Level 6 | Base Area up by 20%. Base Speed up by 20% |
| Level 7 | Cooldown reduced by 0.5 seconds |
| Level 8 | Base damage up by 10 |
At max level, Prism Lass gets +20 Base Damage, +20% Area, +20% Speed, +1 Amount, -1.0 second of Cooldown, plus the 5% freeze chance carrying through. The wiki notes only +1 Amount across all 8 levels, which is unusually low for an Operation Guns DLC weapon (Spread Shot adds +8 Amount across the same scaling). Prism Lass's bidirectional pattern compensates for the low Amount count by doubling effective coverage from each projectile.
The level priority order: level 8 is the standout pick (the +10 Damage step is the largest single damage jump). Levels 4 and 7 both reduce Cooldown by 0.5 seconds each, totaling -1.0 second across both, which combined with the level 6 Speed bonus produces a noticeable cast-rate increase in the minute 8-12 phase.
The wiki lists Limit Break stats: Might +0.5%, Speed +5% (max 200%), Area +2.5% (max 1000%), and Amount +1 (max 10). Pushing Amount to 10 via Limit Break is what turns Prism Lass into a true 360-degree weapon, since 10 bidirectional projectiles produce 5 forward and 5 backward casts per cycle.
Prism Lass evolves into Time Warp at max level (level 8) when paired with both max-level Weapon Power-Up AND max-level Wings. This is a two-passive evolution gate, which is the standard pattern for Operation Guns DLC weapons (Long Gun, Short Gun, Spread Shot, Metal Claw, and Prism Lass all use dual-passive gates).
| Step | Requirement |
|---|---|
| 1. Equip Prism Lass | Play Probotector (auto-equipped) or pick from level-up offers if Prism Lass is already unlocked |
| 2. Level Prism Lass to 8 | Standard level-up path, 7 picks. Don't skip the Cooldown levels (4 and 7) |
| 3. Pick Weapon Power-Up | From the Operation Guns level-up screen. Standard OG-DLC evolution-gate passive |
| 4. Pick Wings | Adds Move Speed. Critical on Probotector since movement direction defines Prism Lass firing direction |
| 5. Max BOTH passives | Both Weapon Power-Up and Wings must be at max level when the chest opens. Roughly 10 combined picks |
| 6. Open chest at min 10 or 20 | Standard evolution gate. Time Warp replaces Prism Lass in the slot |
Pick Wings BEFORE Weapon Power-Up on the evolution path. Wings adds Move Speed, which directly improves Prism Lass's firing-direction control during the minute 5-10 phase. Weapon Power-Up is mostly an evolution-gate passive with a small flat damage bonus, which matters less in the early phase. After a few attempts, the Wings-first pattern produces a smoother run because the directional firing benefits show up immediately.
The strongest Prism Lass build runs Probotector on Neo Galuga or any Operation Guns map. Probotector's Armor-to-Might passive (+10% Might per +1 Armor) reshapes the passive priority order in a way no other Operation Guns character does. Armor pickups from Bracer and stage drops translate directly into damage scaling, which means defensive picks pull double duty as offensive picks.
The build also leans into the freeze mechanic. Clover, normally a niche pickup-rolling passive, becomes a top-three priority because Luck increases the freeze chance per the wiki effects block. Stacking Clover plus naturally-occurring stage Luck pickups can push freeze chance well above the 5% base into territory where freeze procs are happening multiple times per cast.
Probotector+Prism Lass (starting weapon)Prism Lass+Weapon Power-Up +Wings→Time WarpWings (Move Speed = better firing direction control, evolution gate)Weapon Power-Up (damage bonus, evolution gate)
Clover (Luck = freeze chance multiplier)
Bracer (projectile Speed, plus Armor for the Armor-to-Might conversion)
Spinach (Might multiplier on top of Probotector's Armor conversion)
Duplicator (more projectiles = more freeze rolls per cast)Note that Pummarola is intentionally excluded. Probotector's +100 Max Health (200 total) and +1 Armor character bonuses give him survival headroom without explicit healing, and the passive slots are better spent on offensive picks that feed the freeze and Armor-to-Might mechanics. After a few attempts, the Pummarola-skipping build out-DPSes the sustain build by minute 12-15 when difficulty ramps.
Prism Lass is the only Operation Guns DLC weapon with an explicit freeze chance baked into its level 1 effects. The wiki effects block states it directly: "Upon hitting an enemy, Prism Lass has a 5% chance to freeze them. This chance is affected by Luck."
The "affected by Luck" qualifier matters more than it sounds. Most projectile-weapon builds skip Luck because the stat primarily affects pickup-roll rates (chest drops, Arcana spawns, etc.). On Prism Lass, Luck also acts as a damage multiplier indirectly: more freeze procs means more enemies stuck in place, which means more hits before they reach you, which means more total damage output across the cast.
| Source | Luck contribution | Notes |
|---|---|---|
| Clover (passive) | Up to +50% Luck at max level | Standard base-game passive, available on any level-up screen |
| Stage pickups | Variable | Random Luck pickups in chest drops on Operation Guns stages |
| Limit Break Speed | Indirectly via Cast rate | More casts per second = more freeze rolls per second |
| Duplicator (passive) | Per-projectile freeze rolls | Each additional projectile rolls its own freeze chance independently |
Across multiple runs, the practical effect of stacked Luck on Prism Lass becomes obvious during the minute 10-15 boss-wave timing. Frozen elite enemies stop dealing damage for the freeze duration, which combined with Probotector's tanky base stats turns boss waves into farming opportunities rather than survival challenges.
Pale Diamond Incursion (V) is the standard Operation Guns DLC arcana, granting individual auto-aim and Speed-to-Cooldown conversion. On Prism Lass specifically, the Speed-to-Cooldown conversion stacks multiplicatively with the level 6 Speed bump and Bracer's projectile Speed. After a few attempts, this arcana is what pushes the build's effective cast rate into endless-tier output.
Wicked Season (XIII) ramps Curse upward over time, which scales enemy density on the screen. On Probotector specifically, the Curse stack also feeds into more pickup spawns from light sources (per the wiki, Probotector finds special Operation Guns pickups from light sources), which feeds back into the Luck-Clover loop and produces more freeze procs.
The natural weapon pairing for Prism Lass on Probotector is C-U-Laser as the second weapon slot. C-U-Laser evolves into Pronto Beam (a continuous beam scaling with Area), which complements Prism Lass's bidirectional bursts by providing stationary screen coverage. For more aggressive freeze-chaining builds, pair Prism Lass with another freeze-capable weapon if available, or layer Prism Lass with a high-Amount weapon like Spread Shot for more freeze rolls per second. See our Spread Shot guide for the cross-weapon pairing on Ariana.
Prism Lass is the starting weapon of Probotector, who was added in the 9 May 2024 Operation Guns DLC as part of Vampire Survivors patch 1.10 (Laborratory). The Probotector character is one of the deepest Contra references in the entire DLC: in 1987 and 1988, when Contra was released in Europe and Australia, Konami changed the human protagonists Bill Rizer and Lance Bean into robotic versions called "Probotectors" (specifically RD008 and RC011) to comply with anti-violence regulations in Germany. The European releases of Contra, Super C, and Probotector on the NES used these robot protagonists, while the Japanese and North American releases kept the human protagonists.
The Forbidden Scrolls of Morbane unlock spell for Probotector is "rdooeight" per the wiki, which spells out RD008, the canonical droid designation of the European-rebrand Bill Rizer. Probotector's unlock requirement of "Find 7 Barriers" is a direct callback to the Barriers (force fields) that the Probotector droids defended in the European Contra storyline. His base stats also reflect his robotic nature: +100 Max Health and +1 Armor are both higher than human-protagonist Operation Guns characters like Lance Bean (50 Max Health) or Bill Rizer (similar tier). The +20% Might base bonus and the Armor-to-Might passive conversion (+10% Might per +1 Armor) combine to make Probotector a defensive-offensive hybrid that scales with traditionally defensive stats. The theme music "GTR Attack! - VS version" referenced in the wiki is a remix of the original Contra game's iconic boss theme. Operation Guns DLC has now provided playable versions of every major Contra protagonist tier: humans (Bill Rizer, Lance Bean), boss-tier characters (Colonel Bahamut), and the European robotic alternates (Probotector). The DLC essentially serves as a complete Contra fan-service package.
The wiki notes that Prism Lass is unlocked by surviving 15 minutes with Probotector. To play as Probotector, you first need to find 7 Barriers and purchase him for 500 gold. Alternatively, the Forbidden Scrolls of Morbane spell 'rdooeight' unlocks him directly.
Prism Lass evolves into Time Warp when paired with both max-level Weapon Power-Up AND max-level Wings simultaneously when a chest opens. This is a two-passive evolution gate, the same dual-passive pattern shared by every Operation Guns DLC weapon evolution (Long Gun's Prototype A, Short Gun's Prototype B, Spread Shot's Prototype C, and Metal Claw's Big Fuzzy Fist).
The wiki effects block states that Prism Lass has a 5% chance to freeze enemies on hit, and this chance is affected by Luck. Stacking Clover (which adds Luck) and stage pickups that boost Luck increases the freeze frequency above the 5% base. Each projectile rolls its own freeze chance independently, so high-Amount casts produce more freeze rolls per cycle.
The wiki effects block specifies that Prism Lass fires blade-shaped projectiles in the direction the player is moving (or last moved). This is the only Operation Guns DLC weapon with this specific firing-direction logic. Most weapons fire in the direction the character is facing, which can differ from movement direction in chase or strafe situations.
The wiki notes Probotector starts with +100 Max Health, +1 Armor, and +20% Might. He gains +10% Might per +1 Armor, with no cap mentioned. This Armor-to-Might conversion is unique among Operation Guns DLC characters and reshapes the build's passive priority. Armor-adding picks like Bracer become offensive picks on Probotector rather than purely defensive.
The wiki effects block describes the bidirectional firing as a built-in mechanic: 'every second projectile being fired in the opposite direction that the player is facing.' This gives Prism Lass automatic 360-degree coverage when projectile count is high, and solves the rear-flank problem that Long Gun and Short Gun face on the same DLC.
Pale Diamond Incursion (V) is the standard Operation Guns DLC arcana, granting individual auto-aim and Speed-to-Cooldown conversion. Wicked Season (XIII) is a strong secondary pick because it ramps Curse over time, which feeds into more light-source pickups for Probotector and indirectly into the Luck-freeze loop.
Probotector is the European-region rebrand of Contra. When Contra was released in Europe and Australia in 1987-88, Konami replaced the human protagonists Bill Rizer and Lance Bean with robotic versions called Probotectors (RD008 and RC011) to comply with German anti-violence regulations. The Vampire Survivors Probotector character represents this European robotic alternate-universe version, and his cheat code 'rdooeight' spells out the RD008 droid designation.
For other Operation Guns DLC weapons, see our Short Gun guide and our Metal Claw guide. For Castlevania DLC weapons, see our Raging Fire guide, our Ice Fang guide, our Gale Force guide, our Rock Riot guide, our Alchemy Whip guide, our Shuriken guide, our Tyrfing guide, and our Coat of Arms guide. For thrown-projectile and grenade comparisons, see our Javelin guide, our Hand Grenade guide, and our Arma Dio guide. For base game weapons, see our Pentagram guide, our Glass Fandango guide, our Bracelet guide, and our Gaze of Gaea guide. The weapon tier list ranks every weapon in v1.13 and the weapon evolution chart covers every recipe including Time Warp. The passive items guide walks through Wings, Weapon Power-Up, Clover, Bracer, Spinach, and Duplicator. The main Vampire Survivors guide is the hub for everything else.
Image sprites and screenshots sourced from the Vampire Survivors Wiki (vampire.survivors.wiki) under CC BY-NC-SA 3.0.