Rat King build guide

HERESY RAT KING Experimental

by HERESYVersion 3Updated Oct 2, 2026Guide #838910

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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: 54 (as last synced by the API; not match usage)

Author's notes

Grenade max wins midboss fights. If you're fed, maybe 2 outperforms with better solokill threat. Video coming.

Item categories

1Early Core
Author's category · 9 items
1. 1
  Close Quarters
2. 2
  Extra Health
3. 3
  High-Velocity Rounds
4. 4
  Opening Rounds
  Built from High-Velocity Rounds
5. 5
  Point Blank
  Built from Close Quarters
6. 6
  Battle Vest
7. 7
  Fortitude
  Built from Extra Health
8. 8
  Fleetfoot
9. 9
  Heroic Aura
2Lane Healingoptional
Author's category · 3 items
1. 1
  Extra Regen
2. 2
  Sprint Boots
3. 3
  Enduring Speed
  Built from Sprint Boots
3Late Core
Author's category · 4 items · Order Flexible
1. 1
  Siphon Bullets
2. 2
  Colossus
  Built from Extra Health
3. 3
  Witchmail
4. 4
4Spirit Optionaloptional
Author's category · 4 items
1. 1
  Bullet Resist Shredder
2. 2
  Slowing Hex
3. 3
  Greater Expansion
4. 4
5It's probably good to skip Spirit Resilience for 6ks, if possible.optional
Author's category · 3 items
1. 1
  Spirit Resilience
2. 2
  Counterspell
3. 3
  Dispel Magic
6Gun Flexoptional
Author's category · 9 items
1. 1
  Intensifying Magazine
2. 2
  Swift Striker
3. 3
  Titanic Magazine
4. 4
76k Flex
Author's category · 5 items
1. 1
  Diviner's Kevlar
2. 2
  Scourge
3. 3
  Vortex Web
  Built from Slowing Hex
4. 4
8Late Slotfilloptional
Author's category · 2 items
1. 1
  Recharging Rush
2. 2
  Split Shot
9Does Plated Stack With 3?
Author's category · 2 items
1. 1
  Plated Armor
2. 2
  Metal Skin

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 2									Scrap Grenade: 1 AP upgrade, step 11	Scrap Grenade: 2 AP upgrade, step 12