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DeadlockDeadlock Rat King Guide and Overview

In this Deadlock Rat King guide, you’ll learn the fundamentals of his abilities, unique play styles, and fundamental tips.

Nurse Harrow's hero tags are: Scrappy, Regal, Tenacious

Rat King Is the First Hero in the City Never Sleeps Update

Rat King is among the six new Deadlock heroes that are joining the roster with the City Never Sleeps Update.

He was the first of the new heroes to be voted in on October 2nd, 2026.

Out of the sewers and into the streets, the rightful King of the Rats is here at last. Rodent-hating citizens of Manhattan won't be prepared to see his Scrap Grenade bouncing down Broadway, nor for his Swarm of Rats biting at their heels. By donning his Royal Pestments, the Rat King shakes off incoming damage, allowing him to bravely lead the charge into battle. His loyal subjects will feel awed and inspired when they see the great Banner of Rattania waving in the middle of combat, and those who oppose him will rue the day they ever thought they could overthrow the king. - "Oh the rats are taking over, baby!"

You can explore the other new heroes below:

Strengths And Weaknesses Summary

  • Simple kit that's one of the easiest to learn
  • Tanky frontliner with Royal Pestments
  • One of the best teamfight ultimates in Rule, Ratannia!
  • Lacks verticality and ways to deal with flyers/high ground
  • Large size makes him an easy target
  • Low impact if ultimate isn't available

Deadlock Rat King Abilities

Underlined = Scales with Spirit

Scrap Grenade (1)

Throw a grenade of scrap that detonates multiple times, dealing bullet damage and applying slow.

The grenade can be meleed to knock it away.

26s Cooldown

70 Detonation Damage

-20% Move Speed

3 Detonations

8m Detonation Radius

4s slow Duration

Scrap Grenade Upgrades

1 AP

2 AP

5 AP

-8s Cooldown

+79 Detonation Damage

Add an additional final Bigger Detonation

Tips for Scrap Grenade

  • Use Scrap Grenade in combination with quick-hit melee trades to keep its procs on top of your enemies.

Rat Swarm (2)

Call forth a swarm of rats that leap onto enemies, dealing spirit damage over time and reducing their bullet resist with every bite. The more rats are attached, the faster they will bite the target.

Enemies can have multiple rats attached, but can shake off a rat early by performing a ground or air dash.

1 Charges

8s Duration

24s Cooldown

50m Range

10m Radius

8 Damage per Bite

-1% Bullet Resist per Bite

1s Bite Interval | 4s Debuff Duration | 5 Max Attached Rats

Rat Swarm Upgrades

1 AP

2 AP

5 AP

+1 Charges

Increased Swarm Size, +4s Debuff Duration

+8 Damage and -1% Bullet Resist per Bite

Tips for Rat Swarm

  • Rat Swarm is at its best when opponents are out of dashes, make sure to know how many each hero has.

Royal Pestments (3)

Adorn scrappy armor, gaining barrier based on your max health. As long as the armor holds, bullets have a chance to be deflected back towards the attacker.

22s Cooldown

6s Duration

15% Max Health as Barrier

15% Bullet Return Chance

Royal Pestments Upgrades

1 AP

2 AP

5 AP

+4s Duration

-8s Cooldown, +15% Bullet Return Chance

Reduce all damage to a max of 250 +10% Max Health as Barrier

Tips for Royal Pestments

  • Royal Pestments has a respectable amount of uptime since its duration is 6s and its overall CD is 22s. Use the timings to be an oppressive nuisance.

Rule, Ratannia! (4)

Charge up and summon the banner of Ratannia, granting all nearby allies increased move speed, immunity from slows, and reduced incoming damage while near the banner.

160s Cooldown


10s Duration

Banner Aura

+3m Move Speed

+15 Damage Reduction

20m Radius

Slam the banner into the ground causing the sewers below to violently erupt, dealing bullet damage while applying knockup and slow to all enemies in the area. Rats will swarm out of the sewers, applying Rat Swarm to enemies they hit.

Banner Slam

200 Damage

-40% Move Speed

12s Flag Duration | 24m Radius

Rule, Ratannia! Upgrades

1 AP

2 AP

5 AP

+2m Move Speed

+8s Flag Duration, +5m Radius

+150 Damage and +10% Damage Reduction

Tips for Rule, Ratannia!

  • With an AoE movement speed buff for up to 12 seconds before you plant the flag, you can start a teamfight engage from pretty far away. Coordinate with your teammates (especially the lower mobility ones) to really make it count.

Rat King Build Guide

Check out best starter build for Rat King

Deadlock Rat King Weapon Stats

DPS

60

Bullet Damage

6

Ammo

24

Bullets per Second

3.33

Light Melee

50

Heavy Melee

116

Deadlock Rat King Vitality Stats

Max Health

800

Health Regen

2

Bullet Resist

0%

Spirit Resist

0%

Move Speed

6.8 m/s

Sprint Speed

1.6 m/s

Stamina

3

How to Counter Rat King

  • Rat King's can squeeze through the tunnels that are usually reserved for Rem, Calico, and Mo And Krill, be sure to communicate when he goes MIA to limit his gank potential
  • His ultimate, Rule, Ratannia! is a potent win teamfight button. Be sure to track its downtime and capitalize as he isn't that impactful without it.
  • Rat King lacks verticality so he has trouble dealing with flyers and other characters that can maintain high ground against him.