Flail snail

Flail snails were earth-based creatures that produced a number of valuable resources. The residue they left behind as they moved could be harvested to produce glass, and their colorful shells could be used to produce protective magical items, such as spellguard shields and robes of scintillating colors.

Description
Flail snails had between four and six tentacles (typically five) that were kept in constant motion, swaying slowly if it was calm or fast if it was agitated.

Behavior
Flail snails moved slowly consuming everything in their path, including rocks, sand and dirt. They were particularly fond of crystal growths and mineral deposits, and took their time to savor them. They were generally non-aggressive until threatened.

Combat
The club-like tentacles of flail snails had tips of hardened skin with several protrusions that could crush wood easily and were the creature's only form of attack. If a tentacle was sufficiently damaged it would die, but the snail would remain alive and could regrow lost tentacles after a few days, as long as at least one tentacle remained alive.

If all tentacles were killed, the snail retracted into its shell and started crying out a loud wailing sound for several minutes until it died or had its tentacles restored, such as through a regenerate spell. The cry of a dying flail snail could potentially attract other monsters to the site.

The slow metabolism of flail snails rendered them immune to poison, while their thick shells and the wet mucus that covered their bodies rendered them immune to fire.

Ecology
Flail snails were hermaphrodites and reproduced by laying about a dozen eggs after a complex mating ritual with other flail snails that they met casually and then went their separate ways.