The story below is taken from the public domain comic, Fantastic Fears #8, which you can read in it's entirety here.
Armor: 14, HD: 4 (24 HP), Movement -/120', 2 spiny bashes (1d8) or wrestling (1d6 spine damage), Morale 12
The Green Horror is a (hopefully) solitary creature. As the comic says, it's quite patient. Once it finds an object of desire, it does what it can to eliminate all other sources of affection. It typically kills via death hug. It will wrestle an opponent (with a +4 bonus). Targets grappled take 1d6 spine damage every turn). The Green Horror is stationary. However, it can uproot itself and gain a movement of 120' feet. However if it does so it will die in 1d8 hours.