Rat King build guide

BcJ Rat King First Impression

by John StewartVersion 13Updated Oct 4, 2026Guide #838107

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

Author's notes

Eternus 6 Player BCJ with a First Impression Build for Rat King.

Item categories

1Early game
Game stage · 12 items
1. 1
  High-Velocity Rounds
2. 2
  Extra Regen
3. 3
  Extra Health
4. 4
  Intensifying Magazine
5. 5
  Monster Rounds
6. 6
  Cultist Sacrifice
  Built from Monster Rounds
7. 7
  Return Fire
8. 8
  Opening Rounds
  Built from High-Velocity Rounds
9. 9
  Fortitude
  Built from Extra Health
10. 10
  Siphon Bullets
11. 11
  Mystic Expansion
12. 12
  Superior Cooldown
2Late game
Game stage · 8 items
1. 1
  Witchmail
2. 2
  Transcendent Cooldown
  Built from Superior Cooldown
3. 3
  Frenzy
4. 4
3Alternate Defensivesoptional
Author's category · 4 items · only one
1. 1
  Warp Stone
2. 2
  Dispel Magic
3. 3
  Counterspell
4. 4

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 6				Scrap Grenade: 5 AP upgrade, step 10