Flutterings

The Flutterings is a Pureblood Heartless that was introduced in Kingdom Hearts Union χ as a boss in Enchanted Dominion.

Kingdom Hearts Union χ
Having followed the Fluttering from Daybreak Town, eventually pursues it back to a cottage in the glen, where it joins the rest of the Flutterings in attacking Flora, Fauna, and Merryweather, though Player is quick to intervene.

Design
As its name suggests, the Flutterings is really just a swarm of Fluttering Heartless treated as a single enemy, with no differences in the design of each Fluttering from their individual counterparts.