Charge attack on the rat swarm that's attacking Thule! Unless I'm close enough that I can't charge, in which case I'll 5-foot-step and full attack.
Since unarmed strike is bludgeoning damage, it should deal full damage.
Spoiler: Charge
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Attack - (1d20+6)[16]
Damage - (1d6+2)[5]
Spoiler: Full Attack, if possible
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Attack 1 - (1d20+4)[8]
Damage - (1d6+2)[8]
Flurry of Blows - (1d20+4)[16]
Damage - (1d6+2)[4]
If any of the attacks hit it activates scorpion style, which means fortitude save DC 15 or have it's speed reduced to 5 feet for 4 rounds. Although I highly doubt that affects swarms but I'm not sure.