Ekbom's Imaginary Insects

Terrified of insects but determined to win over his fellow student Faith, the apprentice Ekbom developed this spell in order to train himself to overcome his phobia. The illusion apparently worked too well, however, for prolonged exposure to the spell caused Ekbom's unfortunate demise at his own hand, frantically trying to kill the 'bugs' all over his body with a letter opener. Enforcement found his research notes while cleaning out his bunk and continued the spell's use in their more nefarious activities.

An illusionary swarm of insects begins to crawl over the targets skin and begin to burrow into its flesh. At the start of the targets turn, they make a Wisdom saving throw. If they fail, the target will attempt to kill the insects, in effect attacking itself in melee with any means to do so. Doing so takes precedence over any other action the creature may otherwise have taken. The creature hits itself automatically, regardless of AC, but this can never cause a critical hit. In addition, the illusion can be dispelled with Remove Curse and other similar effects. Succeeding in the saving throw, the target will act as normal, but will still be shaken for the remainder of this spell’s duration.

Failing the saving throw will cause the target to spend its turn attacking itself. Because the target is attacking itself and thus distracted, other creatures that threaten it with attacks are granted attacks of opportunity. In addition, the target will also not perform any reactions until the start of its next turn where, if the spell has not ended, they must make another Wisdom saving throw to resist attacking themselves for another round.

Casting at higher levels. When you cast this spell using a spell slot of 3rd level or higher, the duration is increased for one round for each slot level above 2nd.