There are two types of bosses in Rookgard, depending if its possible to regularly spawn them or if they spawn randomly.
| Boss | Spawn |
|---|---|
| Retinite | Regular (Requires 150 Skeleton Archer kills) |
| Avian | Regular (Requires 300 fire spirits) |
| General Ironhorn | Regular (Requires 400 Minotaur massive kills) |
| Giant Mole | Regular |
| Munster | Random |
| Teleskor | Random |
| Rottie The Rotworm | Random |
| Blind Orc | Random |
| Aprenctice Sheng | Random |
| Giant Skeleton | Random |