Fire spiders

Firespiders creates 240 tiny fire elementals in form of small burning spiders. They will form a swarm and search the area for something or someone to attack and ignite. The elementals are immune to fire but vunerable to water or other nonflamable liquids. They will not die after the attack. Instead they will stay until they are slain or bannished or the spell expires.

Components
The caster needs rubys or ruby dust worth at least 500gp. The spell needs also a somatic and vocal component.

History
Thousands of years ago Drow used this spell to set afire large parts of what is now the Border Forest and seperated it from Cormanthor.