Blood Blaze on Swarm + Summon Swarm = Swarm holocaust?

[CommandoDude]

So our party is running RotRL, we just retreated from an encounter with a ludicrous amount of swarms due to not possessing any anti-swarm capabilities.

I came up with the idea of having our party witch use Summon Swarm to remove the infestation, but also found an interesting caveat with Blood Blaze.

What would happen if I cast Blood Blaze on myself, or the swarm (Swarms are technically immune to single target spells, but the spell itself is a single-target spell which has an AoE effect, at the very least I know my DM would rule it could be done) then had another swarm attack it?

Blood blaze states that all creatures within its effect produce 1D6 fire damage when it takes certain amount of damage. Now, a player could only injure one or maybe a few parts of a swarm, but a whole swarm would injure a huge amount of a swarm.

So my question is-

Does a swarm under the effect of Blood Blaze produce multiple instances of 1D6 blood spray fire damage if many of the individual creatures which make up a swarm are injured?

[jwtelesio]

Well, like you said swarms are immune to spells that target specific numbers of creatures (Try picking out a single bee in a swarm and attempting to touch it), but even if you could there are a few problems.

1. Swarms must occupy the same square as their target so at best you'd deal the 1 splash damage to the swarm.

2. The "Swarm" attack deals untyped damage and wouldn't proc Blood Blaze.

3. It already calculates multiple members of a swarm being damaged in the swarm type where they take 50% more damage from area effects. So it wouldn't proc multiple times.

4. Blood Blaze specifically states that a creature can only create one Blood Spray per round. So no massive blood explosions.

Yes, a swarm is considered a single creature.

[My2Copper]

But you could just have your swarm attack the other swarm. They should be able to hurt each other because they deal damage to each creatue they share a square with, not a specific number of creatures.