Rat King build guide
by BrenvilzVersion 27Updated Oct 6, 2026Guide #839443
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L-R build with room for improvising and adapting (read notes!!) Ult got nerfed big but it's still super good. Build focuses more on going green once we've got our ult up and running.
1Early game
Game stage · 10 items · rushing shit for first 1-2 rifts
Opening Rounds
Extra Charge
Arcane Surge
Sell this after 30-35min if you need a 6.4k
Heroic Aura
Rush before rift if nobody on team has it (McG, Graves, etc) stacks super well with ult
2Early Optionalsoptional
Author's category · 10 items · Get enough for 4.8k at least
Extra Regen
needed often because your lane is mediocre at best
Grit
Decent for early lane squabbles, builds into shields
Rebuttal
new melee sound is buff to this
3金鹅蛋?!
Author's category · 1 items · 神秘中国黑科技,能让你带的金鹅蛋在大后期直接把枪刷到数值怪级别 (sell before first rift)
Golden Goose Egg
4EAT YOUR GREENS!!optional
Author's category · 10 items · pick 1-2 ALWAYS
Spirit Resilience
Really helpful since you're massive
Counterspell
if you don't pick this against lash, you're throwing (also good for pocket afflict)
Dispel Magic
fuck vindicta
5Mid game
Game stage · 10 items · rush Hunter's instead of Heroic if ahead for rift
Mystic Slow
Pairs well with weighted shots and ur 2
Fortitude
roam more + tanky, can replace later with witchmail
Superior Cooldown
Built from Compress Cooldown
works for all ur shit why not
6Rat aidsoptional
Author's category · 1 items
Suppressor
if they have m1s
7Late game
Game stage · 9 items · Replace weighted with colossus.
Escalating Exposure
Damage for this is super good if they're forced to fight in your ult or you're hitting many rats, otherwise can swap to overflow
Siphon Bullets
this is better than toxic and gives you one morbillion hp
Witchmail
i fmkn loooov kuuldown....
8works mid ult for some reasonoptional
Author's category · 3 items
Majestic Leap
or Warp Stone
Warp Stone
or Maj. Leap, can sell later if you want
Magic Carpet
this is probably troll but very funny
9interesting itemsoptional
Author's category · 13 items · items i'm testing - feel free to pick any from here and try them out lol
Mercurial Magnum
can be strong on shield but idk
Boundless Spirit
eh
Echo Shard
hahaha more rats... haha unless?
10BUILD PHILOSOPHYoptional
Author's category · 0 items · The biggest misconception with this character is that people think he's a gun carry. He's a spirit/green-oriented hybrid support tank. This build is focused around getting first rift, ulting during EVERY teamfight to boost allies, and constantly debuffing enemies with rats from afar, and eventually becoming immortal with ult spam and max cdr 3.
No items listed.
11HOW TO LANEoptional
Author's category · 0 items · 1 start helps us with early waveclear, but if you'll be bullied too much, 2 or 3 start could be better. If it's a very poke-heavy lane, you get regen and use vents to keep yourself in the fight, and focus on doing boxes and tunnels, and roaming. Trophy could be a good buy in those scenarios.
No items listed.
12PLAYSTYLEoptional
Author's category · 0 items · Never. Stop. Moving. ALWAYS stay in lanes expecting rift, and when a major objective isn't up (e.g rift, urn, midboss), stick around your team to prepare to join a fight. You ESPECIALLY *NEED* to be around if you have your ult up. THIS is your biggest value and playmaker. A good ult will win you the entire game. Always use Arcane Surge before ulting, and use it before using shield every time.
No items listed.
Categories appear in the author's order. Only the editor's default Early, Mid and Late sections are marked as game stages; the author's own categories keep their names. “Built from” links come from the game's item recipes.
Scrap GrenadeScrap Grenade | Scrap Grenade: Ability unlocked, step 5 | Scrap Grenade: 1 AP upgrade, step 14 | Scrap Grenade: 2 AP upgrade, step 15 |
|---|
Duration Extender
Mystic Expansion
even more range for ult teamfights and rift etc
Hunter's Aura
Get before 1st rift if super ahead and no one on team has it, can sell later after ult nerf
Enchanter's Emblem
this or another 1.6k for green spike
Compress Cooldown
even quicker ult
Superior Duration
Built from Duration Extender
works for all ur shit
Trophy Collector
If you're in lower elos and your team likes to fight a lot. Get before 8min if possible.
Enduring Speed
you're fat and wanna roam
Battle Vest
ooga booga no like gun
Debuff Reducer
builds to unstop
Reactive Barrier
Built from Grit
shields op early-mid, builds to indom (if you want)
Spirit Shielding
Built from Grit
sheld,,,,,
Weapon Shielding
Built from Grit
spirit shielding is better but not a bad buy
Indomitable
Built from Reactive Barrier
bebop, haze, any unexpected stuns
Unstoppable
Built from Debuff Reducer
generally don't get both this and indom together, use this while running around in ult
Juggernaut
Built from Enduring Speed
fuck vindicta
Spellbreaker
Built from Debuff Reducer
burst (pocket, mina, etc)
Plated Armor
haze and infernus (your 3 bounces bullets but doesn't stop fixation stacks or afterburn)
Phantom Strike
fuck vindicta and gray talon (pretty useless otherwise)
Cheat Death
rat (get this if the game is longer than 40min somehow)
Diviner's Kevlar
one morbillion hp while ulting
Bullet Resist Shredder
sell later
Greater Expansion
Built from Mystic Expansion
Berserker
Rapid Recharge
Built from Extra Charge
can sell this later if you'd like, rats come back quick
Transcendent Cooldown
Built from Superior Cooldown
You should have at least 2-3 items by now. This helps with that and all your other shi
Colossus
buy before witchmail so u can be fat
Frenzy
Refresher
DON'T USE WHILE UR FIRST ULT IS UP!!!
Spirit Burn
debuff masta for 2 and ult rats
Spiritual Overflow
shooty mcshoot pants - this is the only 6.4k gun item worth buying, but is skippable
Scourge
activate ur stink during ult ideally
Ethereal Shift
live
Vortex Web
probably not worth getting but can make it harder to leave your ult if stacked with other slows or smth idk
Tankbuster
skadoosh (almost nothing procs this)
Radiant Regeneration
kinda fucked up with ur 2 but that's about it
Toxic Bullets
siphon is better
Stalker
99% sure this is terrible but like... if youre crazy try it out? LOL
Close Quarters
lane
Kinetic Dash
gun - not the focus here
Fleetfoot
you're slow so maybe
Torment Pulse
-1 hp -1hp -1hp -1hp
Spellslinger
only good if you have decent gun dmg, which isn't the focus of the build at least
| Scrap Grenade: 5 AP upgrade, step 16 |
Rat SwarmRat Swarm | Rat Swarm: Ability unlocked, step 1 | Rat Swarm: 1 AP upgrade, step 2 | Rat Swarm: 2 AP upgrade, step 11 | Rat Swarm: 5 AP upgrade, step 13 |
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Royal PestmentsRoyal Pestments | Royal Pestments: Ability unlocked, step 3 | Royal Pestments: 1 AP upgrade, step 4 | Royal Pestments: 2 AP upgrade, step 10 | Royal Pestments: 5 AP upgrade, step 12 |
|---|
Rule, Ratannia!Rule, Ratannia! | Rule, Ratannia!: Ability unlocked, step 6 | Rule, Ratannia!: 1 AP upgrade, step 7 | Rule, Ratannia!: 2 AP upgrade, step 8 | Rule, Ratannia!: 5 AP upgrade, step 9 |
|---|
Unlock1 / 2 / 5 AP upgrade costOrder only; no timings
Current patch: the Oct 5, 2026 update, Oct 5, 2026, 11:05 PM UTC to today · ranked and unranked · all match average ranks
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