Bosses (Goop Mod)
< Goop Mod
Goop Mod Currently has 1 Boss and as of right now, none are required for progression.
Pre-Hardmode
There are currently no Pre-Hardmode bosses in Goop Mod
Hardmode
The Crystal Cretin 
The Crystal Cretin is an optional Hardmode boss that can be fought anytime after the Wall of Flesh has been defeated. it drops incredibly strong gear for each class, Including the Tomato Class so its a good idea to face it early on.
Post-Moonlord
There are currently no Post-Moonlord bosses in Goop Mod