The WTF? eats stone. It's slow, and hates everything. May be useful if you're too lazy to mine yourself... Hey, what do you think made all those caves?
And what is this thing anyway? Where did it come from? Ew!
How to Kill
Hack at it with a sword.
With Iron ingots! Why the heck would you want to tame one though?
Drops: iron ingots, gold nuggets