"Receive flat damage reduction from all attacks. Reduce all incoming damage by 5 (+5 per stack). Cannot be reduced below 1." White common item, no unlock required. Flat reduction applied after armor calculation - so it stacks on top of percentage-based armor. Hits every individual damage source: each DoT tick, each burn tick, fall damage, all independently reduced. Cannot reduce any single hit below 1. Does not block Void Fog.
Reduction
-5 dmg per stack
DoT Ticks
Each tick reduced
How Flat Damage Reduction Works
Armor (percentage-based)
dmg_taken = hit / (1 + armor/100)
Diminishing returns. 100 armor = 50% reduction. 200 armor = 66%.
Repulsion Armor Plate (flat)
final = armor_result - (stacks x 5)
Linear. Applied after armor. Min 1 per hit.
Applied after armor, not before. Armor reduces damage by a percentage first, then Repulsion Armor Plate subtracts its flat amount from whatever remains. This means Plate is a separate defensive layer stacked on top of armor, not competing with it. A hit reduced to 20 by armor becomes 15 with 1 Plate, then 10 with 2 Plates, etc.
Every individual tick is reduced separately. Burn, bleed, Void Fog DoT, and all other damage-over-time effects deal damage in multiple ticks. Each tick is treated as its own hit and reduced by -5 per stack individually. A 3-tick DoT with 2 Plates active loses 10 from each tick, not 10 total. This is why Plate is disproportionately strong against multi-tick damage sources.
Cannot reduce any single hit below 1. No matter how many plates you stack, every attack always deals at least 1 damage. You cannot become immune to damage through Repulsion Armor Plate alone. With enough plates you can reduce most early-game hits to 1, but late-game hits will scale past the flat reduction entirely.
Void Fog is explicitly not blocked. The Void Fields' environmental Void Fog deals damage that bypasses Repulsion Armor Plate entirely. All other damage sources in the game are reduced, but Void Fog is the one exception.
Effective Reduction by Stack Count
1 Stack (-5)
-5 flat
vs 200 dmg
195 taken
2.5% off
3 Stacks (-15)
-15 flat
vs 200 dmg
185 taken
7.5% off
5 Stacks (-25)
-25 flat
vs 10 dmg
1 taken
min floor
vs 200 dmg
175 taken
12.5% off
10 Stacks (-50)
-50 flat
vs 10 dmg
1 taken
min floor
vs 50 dmg
1 taken
min floor
vs 200 dmg
150 taken
25% off
20 Stacks (-100)
-100 flat
vs 10 dmg
1 taken
min floor
vs 50 dmg
1 taken
min floor
vs 200 dmg
100 taken
50% off
The Takeaway on Scaling
Flat reduction is most effective against small, frequent hits. Against a 10-damage DoT tick, 1 plate cuts it in half. Against a 1,000-damage boss slam post-loop, 1 plate is meaningless (0.5% reduction). This is why Repulsion Armor Plate is strong early and on DoT-heavy stages, but falls off against the large single-hit damage of late-game elites and bosses.
Why It Excels Against DoTs
Hellfire Tincture self-burn is dramatically reduced. Hellfire Tincture burns you and nearby enemies - your self-burn ticks multiple times per second for small amounts. Each tick is individually reduced by -5 per plate. At 2-3 plates, self-burn ticks often become 1 damage each, making the Tincture's self-damage negligible while you still deal full burn to enemies. This is one of the most practical Plate synergies in the game.
Enemy burn, bleed, and Void damage ticks are all reduced per-tick. Blazing elite fire trails, enemy bleed applications, and Void Fields ambient damage all deal small frequent ticks. Each tick is a separate hit for Repulsion Armor Plate purposes. On Void Fields early, 2-3 plates can meaningfully extend how long you survive between collecting cells.
Lesser Wisp multi-projectiles are each reduced separately. Lesser Wisps fire multiple projectiles per attack. Each projectile is an individual hit, each reduced by the plate. Against Wisp-heavy stages (Distant Roost, Titanic Plains early), plates strip a significant portion of their total burst damage simply by eating the reduction off each shot independently.
Best Survivors
Seeker
S Tier
(SotS DLC)
Seeker's kit revolves around taking controlled damage to trigger healing. Repulsion Armor Plate reduces each hit she intentionally takes, letting her heal more net HP per damage event. This directly amplifies her survival loop - less damage taken per trigger means more efficient healing cycles.
MUL-T
A Tier
High base HP and Transport Mode's +200 armor stack. The flat -5 per plate on top of MUL-T's naturally high armor means small hits become trivial very quickly. MUL-T wants to sit in fights and sustain - Plate directly enables that playstyle early.
Loader
A Tier
20 base armor plus Plate's flat reduction means early-game small hits become negligible immediately. Loader fights up close and takes consistent small hits from melee enemies - Plate strips that chip damage to near-zero while her HP pool handles big hits.
Acrid
A Tier
20 base armor and a melee-range DoT playstyle means Acrid takes constant small hits while enemies die from Blight. Plate reduces that constant chip efficiently. Combined with Acrid's poison self-regen, the net result is very high effective HP against swarms.
Key Synergies
Planula + Repulsion Armor Plate can create net HP gain on rapid weak hits. Planula heals 15 HP whenever you take any damage. Repulsion Armor Plate reduces how much that hit deals. If the hit is reduced to 1 damage but you heal 15 HP, you gain 14 net HP per hit. Against rapid-fire enemies like Lesser Wisps in early runs, this combination makes you effectively unkillable by those enemies while you profit health from each shot.
Hellfire Tincture self-damage becomes near-zero. Tincture self-burn ticks for small amounts repeatedly. At 2-3 Plates, each self-burn tick hits the 1-damage floor. You take no meaningful self-damage while the Tincture still burns everything around you for full damage. This is the defining Repulsion Armor Plate endgame use case.
Tougher Times blocks hits entirely; Plate reduces what gets through. Neither item competes with the other. Tougher Times rolls to block a hit completely. If a hit isn't blocked, Plate then reduces its damage. Both items complement the same defensive approach of making small frequent hits negligible.
Armor items extend Plate's effectiveness window. Repulsion Armor Plate is applied after percentage armor, so high armor reduces hits first - then Plate removes another flat chunk. A hit reduced from 100 to 50 by armor then loses another 5-25 from plates. Survivors with base armor (Acrid, Loader, Mercenary, REX all have 20 base) benefit more from the same number of plates because the armor already brought the hit partway down.
Falls off against post-loop enemies. Enemy damage scales with difficulty time and loops. A hit that does 10 damage in Stage 1 may do 500+ damage in Stage 6. Flat -5 per plate that was 50% effective early is now 1% effective. Repulsion Armor Plate needs to be understood as an early-game and DoT counter item, not a late-game defensive cornerstone. Pick it early, recognize when it has been outscaled.
Frequently Asked Questions
What does Repulsion Armor Plate do in Risk of Rain 2?
Repulsion Armor Plate is a common white item that reduces all incoming damage by 5 per stack. This is flat reduction, not a percentage - it applies after armor has already reduced the hit. Every individual damage source is reduced separately, including each tick of burn, bleed, and other DoTs. No hit can be reduced below 1 damage. Void Fog is the only damage source that ignores it entirely.
How many Repulsion Armor Plates do you need?
It depends entirely on what damage sources you are facing. To reduce a 10-damage DoT tick to 1, you need 2 plates. To reduce a 25-damage hit to 1, you need 5 plates. Against post-loop enemies dealing 300+ per hit, even 20 plates only removes 100 damage - a 33% reduction at best. There is no fixed "right" number; the item is most efficient in the early-to-mid run against small repeated hits.
Is Repulsion Armor Plate good?
Situationally strong early, weak late. Against DoT-heavy stages or rapid multi-projectile enemies in the first two loops, it significantly reduces incoming damage. Its synergy with Planula (net HP gain on weak hits) and Hellfire Tincture (trivializes self-burn) are among the strongest white item synergies in the game. In a vacuum against late-game hard-hitting enemies, it becomes near-irrelevant.
Does Repulsion Armor Plate work on DoTs?
Yes, and this is its greatest strength. Each tick of burn, bleed, collapse, and other damage-over-time effects is treated as a separate hit and reduced by -5 per plate each. A DoT ticking 5 times per second has each of those 5 ticks reduced individually. This is why 2-3 plates can neutralize early-game enemy burn entirely by pushing each tick to the 1-damage floor.
Does Repulsion Armor Plate stack?
Yes, linearly. Each additional stack adds another flat -5 to all incoming damage. 2 stacks = -10, 5 stacks = -25, 10 stacks = -50. There is no diminishing returns on the stacking itself - you always get exactly -5 per additional plate. The diminishing returns come from the fact that enemy damage scales faster than flat reduction late game.
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