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Chub in-game boss portrait

Repentance · Regular boss · Boss #3

Chub

A random boss-pool encounter found in Caves, Flooded Caves.

Read fight guide
ChapterChapter 2
Base HP350
Floor pools2
Locations2

Encounter map

Where to find Chub

Random boss pools
CavesFlooded Caves

Chub appears in 2 random floor pools. The weights below are relative to the other entries in each pool, not a guaranteed encounter chance.

Compare bosses in caves

Fight guide · Caves / Flooded Caves

How to fight Chub

Chub roams in straight lanes, charges when lined up with Isaac, and spawns smaller Chargers.

Normal boss behavior in Repentance. Champion variants can change these patterns.

Before entering

Leave a sideways exit whenever you line up to shoot. A spare bomb gives you another option during a charge.

  1. 1

    Aligned charge

    Watch for: Chub charges when Isaac is directly above, below, or beside her.

    Try: Step out of that row or column as the charge begins, then reposition to shoot again.

  2. 2

    Charger adds

    Watch for: Smaller Chargers compete for the same open lanes while Chub continues moving.

    Try: Clear the ones nearest your dodge route and keep Chub's head in view.

  3. 3

    Bomb in her path

    Watch for: Chub can swallow a bomb placed in her path, briefly stopping before it damages her.

    Try: If you have a bomb to spare, place it in the charge lane and immediately dodge aside; do not stand there waiting.

Reviewed encounter notes. Actual openings vary with your build. Full behavior reference ↗
All boss fight guides

Game-file pools

Spawn entries

2 entries
cavesWeight1Double TroubleRoom 3700
flooded cavesWeight1Double TroubleRoom 3700
Game-file referenceRaw data and official artEntity fields, portrait files, and source notes for this boss.

Raw entity values

Health and entity data

Base HP
350
Stage HP scaling value
0
Entity ID and variant
28.0
Contact damage field
2

These are raw entity fields. Armor, floor scaling, phase transitions, shared health, and scripted waves can make the fight differ from the base HP value.

Asset mapping

Official portrait assets

The Chub versus-screen portrait comes from the supplied game art. The original filenames are retained below.

Chub official game portrait
Chub official boss-name graphic
Portrait file
Portrait_28.0_Chub.png
Boss-name image file
BossName_28.0_Chub.png

Source notes

How this record is built

Boss identity and portrait metadata come from bossportraits.xml. Random floor membership, weights, and Double Trouble room IDs come from bosspools.xml. Health and entity fields come from entities2.xml. Fixed story locations and route explanations are reviewed editorial context.