Everyone loves Jovocs, right?
So, as everyone knows, they have this aura of retribution that damages non tanar'ri within 20ft for half the damage taken (DC15 half) whenever the Jovoc takes damage from any source. This is an (su) ability.
Apologies if this has been done before, but I noticed this today and was amused.
First, we summon up two Jovocs from the abyss.
Now find two cats (or whatever)
Now cast Ability Rip (Sorc/Wiz 7, Serpent Kingdoms) on each Jovoc, transferring aura of retribution to each of the cats.
Dominate Monster (or whatever) the cats and put them in a bag with a flask of alchemical fire.
Throw the bag at your enemy.
Alchemical fire bursts, dealing 1 point of damage to each cat. Auras of retribution trigger, dealing 1 damage (fort DC 15 half) to every non tanar'ri nearby. Order the cats to fail their saves. Auras trigger again, dealing 1 more damage. This process repeats until one of the cats dies.
Okay, so this isn't very impressive with cats, but a resonance bomb like this can be scaled up to absurd levels, with large numbers of high hitpoint "charges" allowing for potentially thousands of points of very difficult to avoid damage.