Beast of the Week: Grasping Hand

This is a bit of a weird one, as it straddles the line between monster and trap.  But then green slime, rot grubs, piercers, trappers, cloakers, lurkers above, and plenty of other "monsters" also straddle the line, so here it is.  Finishing up this month's Beasts with one from both Castlevania AND Ghostbusters.

Grasping Hand
AC: 8 (12)
HD: 1/2* to 3*
Move: 0 (0)
Attacks: 1 claw
Damage: 1d6
No. Appearing: 1d10 (1d10)
Save As: NM to F3
Morale: 12
Treasure Type: nil
Alignment: Chaotic
XP: 6, 13, 25, 50

Grasping hands appear as skeletal, rotting, or demonic arms that suddenly spring out of solid objects or the ground and attack.  They surprise on a roll of 1-4 on d6.  Any hand that hits grabs onto the victim and will not let go until slain (the victim may Save vs. Paralysis to escape).  Anyone grabbed may attack the grasping hand, but at -4 to hit.  Others may make normal attacks, but there is a 50% chance any hit will deal half damage to the victim and half damage to the hand.