Shade
Monster Junkie
Here are precedents for swarmfighting...
Swarmfighting (Ex): Illithocytes can coordinate melee attacks against a single target and are adept at fighting side by side in close quarters. An illithocyte can occupy the same 5-foot square in combat with any other illithocyte at no penalty. When an illithocyte engages a Medium or larger creature in melee, and at least one other illithocyte threatens the target, it gains a +1 morale bonus on the attack roll. This bonus increases by +1 for each additional illithocyte beyond the first that threatens the same target.
Swarmfighting (Ex): Dragon beetles can coordinate melee attacks against a single target and are adept at fighting side by side in close quarters. When a dragon beetle engages a Small or larger creature in melee, and at least one other dragon beetle occupies the target's space, it gains a +1 morale bonus on the attack roll. This bonus increases by +1 for each additional dragon beetle beyond the first that occupies the target's space.
Swarmfighting (Ex): Illithocytes can coordinate melee attacks against a single target and are adept at fighting side by side in close quarters. An illithocyte can occupy the same 5-foot square in combat with any other illithocyte at no penalty. When an illithocyte engages a Medium or larger creature in melee, and at least one other illithocyte threatens the target, it gains a +1 morale bonus on the attack roll. This bonus increases by +1 for each additional illithocyte beyond the first that threatens the same target.
Swarmfighting (Ex): Dragon beetles can coordinate melee attacks against a single target and are adept at fighting side by side in close quarters. When a dragon beetle engages a Small or larger creature in melee, and at least one other dragon beetle occupies the target's space, it gains a +1 morale bonus on the attack roll. This bonus increases by +1 for each additional dragon beetle beyond the first that occupies the target's space.