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Duke of Flies in-game boss portrait

Repentance · Regular boss · Boss #13

Duke of Flies

A random boss-pool encounter found in Basement, Cellar, Burning Basement.

Read fight guide
ChapterChapter 1
Base HP110
Floor pools3
Locations3

Encounter map

Where to find Duke of Flies

Random boss pools
BasementCellarBurning Basement

Duke of Flies appears in 3 random floor pools. The weights below are relative to the other entries in each pool, not a guaranteed encounter chance.

Compare bosses in basement

Fight guide · Basement / Cellar / Burning Basement

How to fight Duke of Flies

The Duke of Flies surrounds himself with flies that block tears, then sends threats toward Isaac.

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

Before entering

Leave space to clear pursuing flies. Aim through an opening in the orbiting group when it is safe.

  1. 1

    Orbiting shield

    Watch for: Flies circling the Duke can absorb your shots while he drifts around the room.

    Try: Keep firing to thin the group and adjust your angle without walking into the boss.

  2. 2

    Released flies

    Watch for: Larger flies chase you, and the orbiting group can break away toward Isaac.

    Try: Clear nearby pursuers before they cut off your next sidestep.

  3. 3

    After the boss falls

    Watch for: Remaining orbiting flies are released, and Repentance adds flies on the Duke's death.

    Try: Keep dodging and shooting until the room is clear before approaching the reward.

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

Game-file pools

Spawn entries

3 entries
basementWeight1Double TroubleNot listed
cellarWeight1Double TroubleNot listed
burning basementWeight1Double TroubleNot listed
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
110
Stage HP scaling value
0
Entity ID and variant
67.0
Contact damage field
1

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

Duke of Flies official game portrait
Duke of Flies official boss-name graphic
Portrait file
Portrait_67.0_DukeOfFlies.png
Boss-name image file
BossName_67.0_DukeOfFlies.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.