What counts toward progress?
Check active swaps, duplicates, pill uses, held trinkets and reroll risks through fifteen illustrated examples.
Transformation progress guide →Completed set
What Beelzebub does
- Grants flight.
- Converts several small enemy fly types into friendly Blue Flies.
- In Repentance, many larger fly enemies become friendly and follow Isaac between rooms and floors.
How to transform
Acquire any 3 collectibles carrying the Repentance fly tag.
Qualifying pickups
Every item that counts
???'s Only Friendfamiliar · quality 1
Angry Flyfamiliar · quality 1
BBFfamiliar · quality 1
Best Budfamiliar · quality 0
Big Fanfamiliar · quality 2
Bot Flyfamiliar · quality 3
Distant Admirationfamiliar · quality 2
Forever alonefamiliar · quality 1
Friend Zonefamiliar · quality 1
Fruity Plumfamiliar · quality 1
Halo of Fliesfamiliar · quality 2
Hive Mindpassive · quality 2
Jar of Fliesactive · quality 2
Lost Flyfamiliar · quality 2
Obsessed Fanfamiliar · quality 0
Papa Flyfamiliar · quality 1
Parasitoidpassive · quality 3
Plum Fluteactive · quality 1
Psy Flyfamiliar · quality 4
Skatolepassive · quality 0
Smart Flyfamiliar · quality 2
The Mulliganpassive · quality 3
The Swarmpassive · quality 2
YO LISTEN!familiar · quality 2Reference
Game data and review
The transformation ID and tagged membership come from the extracted Repentance playerforms.xml and items_metadata.xml files. Item names, IDs, quality values, and icons come from the existing Bamboo Gaming item database. Special cases and effect wording were checked against the maintained Repentance reference. Repentance+ can differ.