Swarm

Calling insects to help in battle is possible with the spell Swarm.

Spell Description
Normally, insects are a nuisance and nothing more. However, they can come in quite handy if there is a need to really destroy a foe's concentration. Casting Swarm conjures a huge swarm of insects that at once attacks the caster's foes. While the insects obviously won't do much physical damage, they can totally distract the target until suddenly the caster lands the death blow.

Trivia

 * The spell was omitted from the C64-Port of Ultima VI.