I’m a new DM, so I’m using a starter pack with a storyline, although I have adapted it a fair amount. Earlier today one of my players decided that he can use Alter Self to create a tentacle which he can use to enter his opponents through their mouths or other holes. Once inside them he says he could just wiggle the tentacle around and squish their internal organs.
I’ve tried arguing that it can’t be done by that spell, but him and some of the others say that it can and it’s really just semantics at this point. Also, I do want to encourage the players to be inventive and I really want them to have fun, but I feel like this is game breakingly over powered. Any advice on how I can limit it or anything else I can do? Please