Carrion Creepers

The carrion creeper is an insectoid monster found in the dungeons of early Sosaria.

Description
Dungeon dwellers that feast upon the remains of the dead, carrion creepers greatly resemble overgrown centipedes or millipedes, with large eyes and sharp mandibles. These stealthy arthropods use their many legs to travel swiftly along labyrinth corridors, attacking the unwary from on high.

As startling as their appearance can be, these scavengers proved relatively easy to defeat. During the Stranger's first adventure, questing to defeat the wicked Mondain, the lord of  Castle Rondorin sent the hero on a mission to slay one of these foul beasts, bestowing advice and an important green gem upon the returned victor once this was completed.

After the death of Mondain, these creatures were not seen again in the lands which would become Britannia

Trivia

 * Carrion creepers are almost certainly derived from the "carrion crawlers" from early installments of the table-top role playing game,  Dungeons & Dragons. The carrion crawlers first appeared in the Greyhawk supplement for the game in 1974, and are described similarly to the creepers of Ultima, possessing a millipede-like body and a scavenger's diet.