Leon Belmont's starting whip from the Ode to Castlevania DLC. Gains permanent damage every time a boss enemy dies, carrying the buff into its evolution.
The Alchemy Whip is the only weapon in v1.13 that gets stronger every time you kill a boss, and the buff sticks for the rest of the run. Per the Vampire Killer wiki entry, each boss kill adds a flat +2 to the weapon's Base Damage, carrying through into the evolution. That means a Cappella Magna run with eight boss waves can finish with the whip dealing roughly 16 extra base damage per swing on top of its already-respectable 55 max, and the gap widens dramatically in Inverse and Hyper modes where bosses spawn more frequently.
The other thing the wiki notes about the Alchemy Whip is that it can be picked from 
Morning Star as a magic whip variant, which is unusual for a DLC weapon. Most Castlevania weapons are locked to their starting characters or DLC chest pools, but Alchemy Whip can show up on any character running Morning Star if you have the Ode to Castlevania DLC installed. From our experience that opens up a wider build space than the wiki tips section suggests.
Alchemy Whip, Leon Belmont's starting whip with permanent boss-kill damage scaling
Vampire Killer with Tirajisu
Leon Belmont and Spinach for raw MightAccording to the Vampire Survivors wiki, the Alchemy Whip fires a horizontal whip strike with a 1.5 second cooldown, a 1.5 second duration, and a baseline 5% critical hit chance with a 2x crit multiplier. It pierces with an Area-of-Effect hitbox, applies a knockback value of 5, and is blocked by neither walls nor terrain. The 0.5 second hitbox delay means damage lands roughly half a second after the swing animation begins, which matters when timing positioning against boss telegraphs.
The signature mechanic is the boss-kill scaling. Per the wiki, both the Alchemy Whip and its Vampire Killer evolution gain a permanent +2 Base Damage every time a boss enemy is defeated. The buff persists across stage transitions in Inverse and Hyper modes and survives all the way through endless runs. By minute 30 on a stage like Cappella Magna, where the major boss waves spawn at minutes 5, 10, 15, 20, 25, and 30, you have already added at least +12 Base Damage on top of the +45 max-level scaling.
Alchemy Whip ignores Speed (cooldown reduction) and Duration. Stacking Empty Tome or Bracer for cooldown does nothing for this weapon, and Spellbinder is wasted on Duration. The damage levers per the wiki are Might (raw multiplier), Area (1.0 base scaling to 1.6 at max level), and Amount (1 base, 2 at max level for an extra whip swing). Crit chance and crit multiplier scale with Luck and any arcana that boosts critical strikes, with Slash (XVI) being the standout per the wiki entry.
Stack Spinach early. Alchemy Whip ignores cooldown stats but loves Might multiplicatively, and Spinach is one of the only passives that scales the boss-kill bonus damage along with the base damage. The math stacks cleanly: every +1 Might percentage point applies on top of the boss-kill stacks, not separately.
Per the wiki entry, here are the base and max-level stats. The damage column is what most players underestimate because the +2-per-boss buff is not visible in the level-up tooltip:
| Stat | Value |
|---|---|
| Base damage | 10 at level 1, 55 at level 8 (+45 across levels) |
| Boss-kill bonus | +2 Base Damage per boss defeated, permanent |
| Max level | 8 |
| Rarity | 80 |
| Starting weapon for | Leon Belmont |
| Cooldown | 1.5 seconds |
| Duration | 1.5 seconds |
| Projectile interval | 0.3 seconds |
| Hitbox delay | 0.5 seconds |
| Area | 1.0 base, 1.6 at max (+60%) |
| Amount | 1 base, 2 at max (+1 whip) |
| Crit chance | 5% base, scales with Luck |
| Crit multiplier | 2x |
| Knockback | 5 |
| Pool limit | 100 |
| Ignores | Speed and Duration |
| Unlock | Survive 6 minutes with Leon Belmont in any stage. |
| Picked from | Magic whip variant of Morning Star |
Per the wiki, level Alchemy Whip to 8 and pick up 
Tirajisu (Tirajisu) at any level. Tirajisu is a Revival passive with max level 2 that revives once with 50% Health, and it can be found as a stage item on Cappella Magna, Moongolow, Boss Rash, and any Ode to Castlevania stage. Open any standard chest from minute 10 onward and the evolution triggers, with a first-time 500 gold reward.
| Base weapon | Passive needed | Becomes |
|---|---|---|
| Alchemy Whip (Lv 8) | Tirajisu (any level) | Vampire Killer |
Per the wiki, Vampire Killer keeps the same +2 Base Damage per boss kill mechanic from the Alchemy Whip, with all stacks accumulated pre-evolution carrying forward. So if you killed three minute-5 bosses before evolving at minute 10, you walk into Vampire Killer with +6 already baked in. That makes pre-evolution boss farming on stages with mid-stage spawns (Library, Inlaid Library, Cappella Magna) directly meaningful for endgame DPS.
The other reason this evolution matters specifically for Leon Belmont is the character bonus. Per the Leon Belmont wiki entry, evolving Vampire Killer grants Leon a one-time stat package: +80 Max Health, +0.1 Recovery, +1 Armor, +1 Amount, +1 Revival, +10% Move Speed, +10% Might, +10% Speed, +10% Area, +10% Luck, +10% Growth, and -5% Cooldown. That is one of the biggest single-evolution character payoffs in v1.13.
Per the Alchemy Whip wiki entry, evolving the weapon while you have the 
Black Disk relic in your inventory unlocks 
Sara Trantoul as a playable character. The Black Disk is found on Ode to Castlevania stages, so this is a one-shot unlock you can plan into a Leon run with minimal extra effort.
Save your evolution chest for after a boss wave. The +2 Base Damage stacks before the chest opens, so killing the minute-10 boss first and then opening the chest gives the Vampire Killer a +2 head start the moment it appears. Multiply that by every boss wave you survive pre-evolution and the math is significant.
Per the Leon Belmont wiki entry, Leon starts with +20 Max Health (120 total), +1 Armor, +1 Revival, and +5 Reroll. He also receives a hidden 
Svarog Statue at character level 5 that levels up every 10 character levels. The build below pairs the boss-kill scaling with the Svarog Statue secondary damage and the large evolution stat package to push the Vampire Killer into endless-mode DPS territory.
Alchemy WhiptoVampire KillerSvarog Statuehiddenauto-levels with characterMorning Starcoverssecondary whip damageTirajisurequiredfor evolution and Revival
SpinachscalesMight multiplicatively
CandelabradorscalesArea for whip footprint
DuplicatorscalesAmount for extra whips
Hollow Heartscalessurvival in late-run boss wavesThe build's clock is set by minute 10 like most v1.13 evolutions. The trap with this specific weapon is rushing the evolution before clearing the minute-10 boss. Per the wiki, the +2 Base Damage stacks before the chest opens, so killing the boss first and then taking the chest gives the Vampire Killer +2 from the moment it spawns. Stack two more boss waves on top of that and the evolved whip walks into the late game with enough damage to oneshot most trash without any Might multipliers.
According to the wiki entry, Slash (XVI) is the strongest arcana for Alchemy Whip and its Vampire Killer evolution. Slash boosts critical strike multiplier from 2x to 4x, which stacks on top of the +2 per boss base damage and the 5% Luck-scaled crit chance. By minute 25 of a Cappella Magna run with Slash active, individual whip strikes can clear entire boss-wave tails in one swing.
For passives outside the core build, Empty Tome is wasted because Alchemy Whip ignores cooldown. Spinach is the priority pick because Might multiplies the entire damage pool, including the boss-kill stacks. 
Bracer is also a non-pick since Speed (cooldown reduction) does nothing here. 
Pummarola is a marginal pick if you are running Inverse mode where the late-run boss density is high enough that survival becomes the bottleneck.
Black Disk unlocks Sara Trantoul. Players who skip the relic on their first Vampire Killer evolution have to do the entire setup again on a future run. Pick up the Black Disk before the minute-10 evolution chest if Sara is still locked.The Alchemy Whip is a direct callback to the original Castlevania weapon system, where the Vampire Killer whip itself is the legendary Belmont family heirloom passed down across the entire series. Per the Vampire Survivors wiki entry, Leon Belmont (1094 AD) is the first Belmont to wield the whip, predating Trevor, Simon, and Richter Belmont chronologically in the Castlevania timeline. Leon's weapon is named the Alchemy Whip specifically because in the Castlevania lore, the whip became the Vampire Killer only after Leon's wife Sara Trantoul sacrificed herself to imbue the leather whip with vampire-slaying power.
That lore explains the in-game mechanic. The Alchemy Whip starts as a regular alchemical-treated whip (the boss-kill stacks represent it absorbing power from the dead), and only becomes the Vampire Killer after evolution unlocks the full Vampire Killer awakening. The Sara Trantoul character unlock, gated behind evolving the weapon while holding the Black Disk relic, is the wiki's nod to her sacrifice in Lament of Innocence (the 2003 PS2 prequel that introduced Leon Belmont). The Belmont family theme music referenced in the Leon entry is "Lament of Innocence" itself.
Per the wiki, survive 6 minutes in any stage as Leon Belmont. Leon himself is unlocked by finding and opening the first coffin on the Ode to Castlevania stage and costs 10 gold. The Alchemy Whip requires the Ode to Castlevania DLC.
It evolves into Vampire Killer when held at level 8 alongside Tirajisu at any level. The chest must spawn after minute 10. Evolution rewards 500 gold first time and grants Leon Belmont a substantial one-time stat package.
Yes. Per the Vampire Killer wiki entry, both forms gain +2 Base Damage per boss kill, and stacks accumulated on the base Alchemy Whip carry forward into the evolved Vampire Killer. Pre-evolution boss farming directly buffs the endgame weapon.
Per the wiki, evolve Alchemy Whip into Vampire Killer while you have the Black Disk relic in your inventory. The Black Disk is found on Ode to Castlevania stages. Once both conditions are met, Sara Trantoul becomes available as a playable character.
Yes. Per the wiki, Alchemy Whip can be picked from Morning Star as a magic whip variant. Any character running Morning Star with the Ode to Castlevania DLC installed can roll Alchemy Whip on a level-up. Outside of Leon, you lose the evolution stat package but keep the boss-kill scaling.
Might (raw multiplier), Area (1.0 to 1.6 over 8 levels), and Amount (1 to 2 over 8 levels). Per the wiki, the weapon ignores Speed (cooldown) and Duration. Luck scales the 5% crit chance, which Slash (XVI) further multiplies.
Yes, especially on Leon Belmont with the boss-kill scaling and the evolution stat package. On stages with high boss density (Cappella Magna, Inlaid Library, Inverse mode), the post-evolution Vampire Killer is one of the strongest single-target weapons in v1.13. See our weapon tier list for the full ranking.
That is the boss-kill scaling kicking in. Each boss enemy you defeat adds +2 Base Damage permanently, and the buff is not announced in the UI. If you see the damage number jump after a boss wave, that is the wiki-confirmed mechanic at work.
For more Castlevania DLC weapons, see our Rock Riot guide covering Carrie Fernandez's starting weapon. For base-game coverage, the weapon tier list ranks every weapon in v1.13 and the weapon evolution chart covers every recipe. The passive items guide details Tirajisu, Spinach, and Candelabrador, and our arcanas guide walks through Slash (XVI). Boss-fight tactics live in the bosses guide, with related coverage in our relics guide for the Black Disk. Leon's spot in the cast is covered in our character tier list alongside Trevor Belmont, Alucard, and Soma Cruz. 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.