Summon Swarm

Least Invocation
2nd Level Spell

You can summon forth a swarm of normally harmless creatures as long as you maintain concentration. They crawl over enemies, dealing 1d6 damage, as well as an additional effect depending on the type of creature. Rat swarms have a chance of poisoning their victims, and bat swarms can wound their victims, making them bleed one HP a round until treated.