Rat King build guide

i like big bombs and i cannot lie! [ANNOTATED]

by Blue Thicc FishVersion 94Updated Oct 6, 2026Guide #848963

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Observed usage

Match statistics · filters applied except game mode

Published guide

As written by the author · latest version · not affected by filters

In-game favourites: 329 (as last synced by the API; not match usage)

Author's notes

BOMB JUST GOT BUFFED, ITS OP NOW! your team fight is kinda crazy and the bomb does INSANE DAMAGE and hits OFTEN due to size and tracking, the slow is crazy too, since spirit is in this build. CHANGES: ULT UPGRADES SLIGHTLY SOONER, ULT SUCKS UNTIL T3, SO WE WANT THE SPIKE QUICKER! TESTING THINGS SO IGNORE THE MANY BUILD VERSIONS still a wip! any suggestions my disc is bluethiccfish, im always open!

Item categories

1Lane/Early Game
Author's category · 6 items · L to R, get gun spike early!
1. 1
  Monster Rounds
  goes into cultist later!
2. 2
  High-Velocity Rounds
3. 3
  Opening Rounds
  Built from High-Velocity Rounds
  good early damage
4. 4
2Lane Optionsoptional
Author's category · 9 items · you can also go for a 1.6k green in the box below if you need them!
1. 1
  Extra Health
  just some extra hp, youll be squishy-ish early so might be worthwhile. goes into fortitude or colossus later if you take that path!
2. 2
  Grit
  decent item in general, good against spirit burst characters, also goes into spirit shielding!
3. 3
  Healing Rite
3if slotlocked, sell opening, 1.6k green if you dont plan to use it for an upgrade, then cultist, fleetfoot last WITH THE NEW PATCH, BOMB DOES MORE DAMAGE AND TRACKS INSANELY WELL, BOMB IS ON
Author's category · 0 items
No items listed.
4Core/Mid Game
Author's category · 6 items · now we splodin, L to R!
1. 1
  Compress Cooldown
  GO TO GREEN SPIKE TAB AND HIT 4.8K, THEN COME BACK! can be rushed since bomb is that crazy now
2. 2
  Ballistic Enchantment
  Built from Mystic Expansion
  THE core of the build, an insane boost in damage, and later range! get in every objective teamfight you can! rift, midboss, even urn...
3. 3
  Echo Shard
5GREEN SPIKE
Author's category · 9 items · BUY AFTER COMPRESS CD, HIT 4.8K SPIKE! CAN BUY EARLIER, BE AWARE OF ACTIVES
1. 1
  Return Fire
  the best 1.6k for rat king, deflects a good amount of damage and protects you further with your 3!
2. 2
  Spirit Shielding
  Built from Grit
  grit goes into this, essentally better shielding from spirit, good if you want small spirit resist and shielding while taking something like dispel or counterspell instead of spirit resilience
3. 3
6Late game
Game stage · 5 items · L to R, but can prio other items first
1. 1
  Superior Cooldown
  Built from Compress Cooldown
  really strong with rat swarm now, lots of uptime
2. 2
  Transcendent Cooldown
  Built from Superior Cooldown
  4 actives means we GOTTA get this
3. 3
  Siphon Bullets
7Super Late/Miscoptional
Author's category · 12 items · late late game items or just good items if you wanna take a detour! some more niche items im testing are in here too.
1. 1
  Colossus
  Built from Extra Health
  insane health boost, best all around option. lots of extra 3 shield, more resists, and enemy slows so they cant run from bombs >:3
2. 2
  Vampiric Burst
  THIS WORKS WITH BOMBS, time it right when the big explosions happen for insane healing
3. 3

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.

Published ability order

Published ability order: unlocks and upgrades in the author's order, one row per ability in slot order
Scrap GrenadeScrap Grenade	Scrap Grenade: Ability unlocked, step 1	Scrap Grenade: 1 AP upgrade, step 2			Scrap Grenade: 2 AP upgrade, step 5			Scrap Grenade: 5 AP upgrade, step 8