Huge, poisonous spider
From MUME
Huge, poisonous spiders are aggressive level ~11-12 mobiles, found in various places across Arda. They have a poisonous bite that can afflict you with Arachnia.
A huge, poisonous spider is here. >examine spider This disgusting creature is the size of a man crawling on all fours. It has eight hairy legs that gives it a tremendous speed on almost any surface and sharp poisonous fangs to paralyse or kill its prey.