Board Thread:Suggestions Forum/@comment-95.175.146.128-20141111084823/@comment-25560665-20141111164146

Well, another idea, trolls WERE made from some race, since Morgoth didn't have access to "Secret Fire". Also they turn to stone when under sunlight and it is hinted in Hobbit and LotR that stone is their original form.

We could have slow creatures that are partly made of stone (or obsidian), due to this are immune to ranged weapons.