You summon a number of monstrous insect swarms, each of which attacks any creature occupying its square. Each square of the spell's
effect contains a
swarm of monstrous spiders, monstrous scarab beetles, or monstrous centipedes, to a maximum of 12 swarms, assuming that the spell's
effect isn't blocked by obstacles. The swarms are stationary after being summoned, and won't pursue creatures that flee. Use the monstrous spider
swarm statistics for monstrous scarab beetle swarms and monstrous centipede swarms as well.