What's a Killer Tree?

In the outdoor wandering monster tables in MECC1, you'll find listed a Killer Tree. "What the heck is that," you may be asking (especially if you're not familiar with old BECMI monsters). And, even if you are familiar with them, there's no C&C stats listed in the module. I've added a small PDF with information on this creature to the order on both Big Geek Emporium and DriveThruRPG, but figured I'd put it here for reference as well.

Killer Tree
AC: 15 HD: 6 (d10) Size: L MV: 0’
Att: 4 limbs/1 mouth Dmg: 0/0/0/0/3d6
Special: grab, digest
Save: P Int: Nil AL: N XP: 180+6

​These creatures look identical to large trees, and indeed are almost impossible to tell apart from any normal trees around it. They come in many varieties; killer trees can be found which match almost every large tree species. Elves and druids have a slight chance to notice them from a distance (CL 15 wisdom check), all others have no chance until it’s too late.

Four of the trees’ limbs act as tentacles, and can reach out to 20’ to attack. On a successful hit, the limb wraps around the victim, and on the next round will pull the victim to the tree’s mouth. Attacks against the limb which cause 10 or more points of damage will sever it. One attack can only sever one limb, regardless of damage done (a hit for 50 points of damage would still only sever one limb, not all of them). 

Once dragged into the tree’s mouth, victims take an automatic 3d6 points of damage per round from the gnashing, crushing action of the tree’s mouth and the digestive sap therein.