Arachir are Demons from Daemonrealm. They are very small, only about 1 foot in legnth, but are very deadly. They look like twisted, corrupted versions of spiders with poisonous fangs and, although unable to spin webs, can create soft clumps of poisonous silk to be used for many various reasons. They never hunt alone and are usually in swarms of anywhere from 10 - 200, making them effective cannon fodder, assassins, scouts and shock troops.
The name, Ara'chir in demonic means "poison swarm"