I figured it out

effect: .name "DamageTargetSkellington" .target "target" .chance 100% .health_damage 7 .on_hit true .on_miss false

Just plug that into an attack and it works

I want to make a mod that focuses around summoning enemies that help attack the other enemies. I tried changing the brigand fusilier's (The tutorial one) blanket fire move to hit his side. That failed. I then tried to make his AI target allies. He now keeps targeting himself, and doing no damage but debuffing himself. Does anyone have any ideas how I could make them deal damage, or, failing that, how I could make a custom DoT that simulates them getting hit?