Swarm
Creatures with the "#Swarm" Creature Tag can come together to form a Swarm. To form a Swarm, there needs to be 5 or more of the same creature within a Spitting Distance(4u) of one another. When this happens, the group can form together into a Swarm as a Free Action.
As a Swarm, the creatures are no longer tracked individually, but share a pool of Health and Vitality equal to the sum of all their Health and Vitality combined. A Swarm starts as a Huge(4u) Sphere Shape. For every 5 creatures in the Swarm after the first 5, the swarm grows one Size (covering a Massive(8u) Sphere at 10 creatures and Gargantuan(16u) at 15 creatures.) A Swarm can use any Abilities of its creatures to target any or all creatures within their Swarm area simultaneously. For every 5 creatures in the Swarm, they also gain an Advantage on any Tests for the Abilities they perform.