Anvillian moves to J13, drawing his Falchion as he travels. He announces "Stay focused, we can handle these mosquitoes." as he confidently swipes his blade in a Rallying Strike.

Spoiler: Actions
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Free action, activate Holy Fury, swift action, spend 1 point on Furious Strike +4 to hit and 2d6 damage.

Trading 5 chance to hit for Stone Power, upon a successful hit, I'll gain 10 Temporary HP.
Attack using Rallying Strike.
(1d20+30)[36] to hit
It may deal no damage due to the swarm's nature, but if it does it deals,
(2d4+18)[25] plus (2d6)[5] damage.

If the attack is successful (not sure if that means hits or deals damage) and the enemy's alignment isn't LG, all allies within 30ft are healed for (3d6+15)[20] HP.