[Rumil]

Lovely riddle earlier Pitchwife,

now for Morsul's latest-

I guard the hidden
in a place I don't fit in - The Mines of Moria hidden behind the secret door
Do not Disturb me
Or you'll be in my grasp see - Nasty slimey tentacle-y grasp
When you have fled
the door, I'll crash on your head - And waste a couple of Holly trees just for good measure

So it must be The Watcher in the Water - yes?

Rumil