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How to play Rat King

Best build by measured win rate · patch 09-29-2026 · updated Oct 14 · Rat King wins 57.8% overall

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The Rat King build

Each tier lists the items Rat King players win with most often, out of 784,095 Rat King games. Win % is how often Rat King wins when the item is bought; the green or red number is how far that is above or below the rest of the same tier. Popularity is the share of Rat King games the item was bought in; Bought at is the average time. Only items bought in at least 1,500 games and by at least 5% of Rat King players count, so a lucky streak can’t make the list.

Lane · Tier 1 · 800 souls

Early mid game · Tier 2 · 1,600 souls

Mid game · Tier 3 · 3,200 souls

Late game · Tier 4 · 6,400 souls

Situational / optional

Fewer Rat King players buy these, usually against particular enemies, but those who do win clearly more than the rest of the same tier. Each still has at least 1,500 games behind it.

Popular, but behind the rest of their tier

Not wrong to buy, and sometimes the right answer to a specific enemy. On average, Rat King players who buy these win less than those who buy something else at that point.

How this build is chosen

Source: deadlock-api.com item results for Rat King, City Never Sleeps matches since 2026-09-30, refreshed daily. Items are compared with the rest of their own tier, because late items always show higher raw win rates (only players who are ahead can afford them). Ranking uses the low end of each item’s 95% confidence range, so more games beat a lucky few. It shows what winning Rat King players buy; it can’t prove the item caused the win. For what to change against a specific enemy team, use the matchup tool.

How Rat King plays

Strengths

  • Makes his whole team's guns better: stacking bullet-resist shred from Rat Swarm Rat Swarm 50m Range6s Duration24s Cooldown Rat King calls a swarm of rats to a spot up to 50m away. Damage 8 spirit damage per bite (+0.08 Spirit scaling), one bite per attached rat… 1 +1 charge (8s between charges) 2 a larger swarm and +4s debuff duration 5 +8 damage and an extra -1% bullet resist per bite
  • Team-wide engage with slow immunity and speed, then a damage-reduction zone
  • Strong wave clear and a slow in one cooldown
  • Can rotate unseen through the map's tunnels when not in a fight

In lane

  • Scrap Grenade Scrap Grenade 26s Cooldown Rat King throws a bouncing lump of scrap that goes off three times where it lands. Crowd Control 20% movement slow for 4s (scales slightly with Spirit). Damage 70 bullet damage per detonation (+0.6 weapon-damage scaling), three… Defensive The slow is his peel: thrown at his own feet it stops a diver from following… 1 -8s cooldown (26s to 18s) 2 +70 damage per detonation 5 one extra, bigger final detonation — 300 damage, 14m radius, 40% slow clears a trooper wave in three hits and slows anyone farming in it, so he wins wave tempo early
  • Royal Pestments Royal Pestments 6s Duration22s Cooldown Rat King puts on scrap armour that gives him a barrier worth a share of his maximum health. Damage Reflected bullets return their full damage to the shooter. Defensive Barrier equal to 15% of his max health for 6s on a 22s cooldown. 1 +4s duration 2 -8s cooldown and +15% bullet return chance 5 +10% max health as barrier, and no single hit deals more than 250 while it holds lets him take a trade or tower shots that other brawlers cannot, and reflects part of a long poke trade
  • Rat Swarm Rat Swarm 50m Range6s Duration24s Cooldown Rat King calls a swarm of rats to a spot up to 50m away. Damage 8 spirit damage per bite (+0.08 Spirit scaling), one bite per attached rat… 1 +1 charge (8s between charges) 2 a larger swarm and +4s debuff duration 5 +8 damage and an extra -1% bullet resist per bite reaches 50m, so he can chip and shred a laner who is out of his gun range

Power spikes

  • Rule, Ratannia! Rule, Ratannia! 10s Duration160s Cooldown Rat King raises the banner of Ratannia. Crowd Control Knockup and a 40% slow on the slam, plus Rat Swarm from the rats it… Damage 200 bullet damage on the slam (+1.2 weapon-damage scaling), 20m radius (cut… Mobility +3 m/s movement speed for him and nearby allies for up to 10s while the… 1 +2 m/s movement speed (no cooldown reduction since 5 October) 2 +5s banner duration and +8m radius 5 +150 slam damage and +10% damage reduction unlock — Rule, Ratannia! Rule, Ratannia! 10s Duration160s Cooldown Rat King raises the banner of Ratannia. Crowd Control Knockup and a 40% slow on the slam, plus Rat Swarm from the rats it… Damage 200 bullet damage on the slam (+1.2 weapon-damage scaling), 20m radius (cut… Mobility +3 m/s movement speed for him and nearby allies for up to 10s while the… 1 +2 m/s movement speed (no cooldown reduction since 5 October) 2 +5s banner duration and +8m radius 5 +150 slam damage and +10% damage reduction turns him into the team's fight-starter: slow immunity and speed on the way in, a 20m Knockup on arrival
  • Scrap Grenade Scrap Grenade 26s Cooldown Rat King throws a bouncing lump of scrap that goes off three times where it lands. Crowd Control 20% movement slow for 4s (scales slightly with Spirit). Damage 70 bullet damage per detonation (+0.6 weapon-damage scaling), three… Defensive The slow is his peel: thrown at his own feet it stops a diver from following… 1 -8s cooldown (26s to 18s) 2 +70 damage per detonation 5 one extra, bigger final detonation — 300 damage, 14m radius, 40% slow T2 — 140 damage per detonation turns the grenade from wave clear into a real trade — three hits for 420 before weapon scaling
  • Royal Pestments Royal Pestments 6s Duration22s Cooldown Rat King puts on scrap armour that gives him a barrier worth a share of his maximum health. Damage Reflected bullets return their full damage to the shooter. Defensive Barrier equal to 15% of his max health for 6s on a 22s cooldown. 1 +4s duration 2 -8s cooldown and +15% bullet return chance 5 +10% max health as barrier, and no single hit deals more than 250 while it holds T2 — The barrier comes back every 14 seconds with a 30% reflect chance, so gun trades into him stop being free
  • Royal Pestments Royal Pestments 6s Duration22s Cooldown Rat King puts on scrap armour that gives him a barrier worth a share of his maximum health. Damage Reflected bullets return their full damage to the shooter. Defensive Barrier equal to 15% of his max health for 6s on a 22s cooldown. 1 +4s duration 2 -8s cooldown and +15% bullet return chance 5 +10% max health as barrier, and no single hit deals more than 250 while it holds T3 (late game) — The 250-per-hit cap makes him very hard to burst while the armour holds

Weak points to cover

  • No dash, leap or blink — once his barrier is gone he is easy to catch and kite
  • Slow projectile spreadshot with falloff from 20m; long-range heroes can stay out of his damage
  • Most of his kit is Bullet Damage, so one bullet-resist item answers most of it

Next

Rat King’s hardest matchups

Best teammates

  • Victor Victor BruiserInitiatorClose rangeSpirit damage Highest win rate in this group (around 56% on deadlock.one's current-patch sample) — currently a strong pick Durability very high (3/3) Burst high (2/3) Mobility high (2/3) Healing very high (3/3) 65.2% duo win
  • Graves Graves ControllerSummonerClose rangeHybrid damage Best-in-class unattended map pressure via Borrowed Decree Ghouls marching at objectives Durability low (1/3) Burst low (1/3) Mobility none (0/3) Healing low (1/3) 64.4% duo win
  • Kelvin Kelvin SupportControllerMid rangeHybrid damage Frozen Shelter is a hard physical barrier that stops ranged damage and ultimates outright Durability high (2/3) Burst low (1/3) Mobility high (2/3) Healing very high (3/3) 63.0% duo win

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