Summon Ants

This is a first-level MU spell for my Amazon Rivercrawl game.

Caster summons a swarm of ants whose HD is equal to the MU’s level. Nearby ants gather through the forest to come to the Caster’s magical pheromones. The swarm lasts as long as the caster is concentrating, and the caster can direct them to various foes. The swarm has one attack, the largest on this table for its HD.

Once the caster’s concentration is broken (by attacking, being successfully attacked, casting another spell, or pretty much doing anything that isn’t walking slowly), the swarm will lose one HD per round until it has dissipated, and it will fully dissipate if its current foe falls. To attack the swarm, the foe must make a grapple attack vs. the swarm’s HD. If it succeeds, the ant swarm loses 1HD regardless of the caster’s concentration.

While swarmed, a foe is at -2 to hit anything that is not the swarm itself.

When casting, the player roles 1d4 on the following chart to see what kind of ants respond.

1. Fire ant. On successful attack, the foe saves vs. poison. On success, half damage is done. On failure, full damage is taken. If an attack does 6pts or more of damage, then save vs. paralyze or be paralyzed for d6 rounds in pain.
2. Leafcutter ant. On successful attack, no damage is taken. Instead, leafcutters attack the skin and clothes of the foe. -1AC for each successful attack.
3. Weaver ant. On successful attack, no damage is taken. Instead, the foe must save vs. paralyze or be stuck (-4 to attacks, AC, and can't move) for d4 rounds (cumulative) in the ants’ sticky gauze. 
4. Army ant. On successful attack, ants do full damage.