The carrion crawler is a monster added in SLASH'EM. It is notable for having 6 attacks, each of which can cause paralysis.
Not a great threat. High magic cancellation renders their attacks mostly ineffective, and they do very little damage. Try not to fight them when other monsters are around, just in case they manage to paralyze you. Their paralysis does not last long enough to be terribly dangerous, however.
Their corpses can be eaten for a chance at poison resistance, although they appear somewhat later in the game.