Synthoil
ItemRebirthUnlocked
passiveGame ID 345★★★★
How do you unlock Synthoil?
Verified starting unlockSource data confirms that no unlock is required.
[Before Repentance] +1 damage, +5.25 range, +0.5 tear falling speed. / [Repentance] +1 damage, +2.5 range.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Synthoil leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13