It is true we don't have a bestiary... It would be kind of neat if just a little difficult to maintain (unless someone would like to help winkwinkatplayersatlarge). That said, we do allow players a great deal of freedom creativity when it comes to what kind of animals are around! So if there is something like a giant slug you'd like for your character to encounter, you can just ping us to see if it's okay and we can give the go ahead.

(for the record yes on giant slug)