Bob is a transformation in The Binding of Isaac, added in the Afterbirth DLC.
Obtained by acquiring any 3 items with the bob tag.
Makes Isaac leave green poisonous creep on the ground that deals 20 damage per second.
Grants poison immunity.
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this transformation for the previous Repentance version, check this page instead.