SpireForge

Updated for Data 2026-03-17Early Access — numbers may shift with patches.

Byrdonis Egg

Colorless · Quest · Quest · 0 cost

Base

Byrdonis Egg

Upgraded

Byrdonis Egg

Card text

Unplayable. Can be hatched at a Rest Site.

Byrdonis Egg

Unplayable. Can be hatched at a Rest Site.

Keywords

Unplayable

Build context

Colorless cards splash into every class. Browse the Colorless card pool and pair it with any class build hub for archetypes that want it.

Related cards

Lantern Key
Spoils Map
Ascender's Bane
Bad Luck
Burn
Clumsy
Curse of the Bell
Curse of the Bell
Dazed

Byrdonis Egg FAQ

Should I upgrade Byrdonis Egg in Slay the Spire 2?
Compare the upgraded text: Unplayable. Can be hatched at a Rest Site.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Byrdonis Egg?
Byrdonis Egg is tagged as a Colorless card. Colorless cards can be picked by any class.
What character uses Byrdonis Egg?
Byrdonis Egg is tagged as a Colorless card. Colorless cards can be picked by any class.

Patch history

SpireForge snapshots card text from Untapped exports dated 2026-03-17. When Mega Crit ships a balance patch, we re-run the scraper and refresh every affected URL—see /patches for the editorial log.