Flame Core

Flame Core is a Heartless that appears in Olympus and Monstropolis in Kingdom Hearts III.

Kingdom Hearts III
After their small confrontation with Hades on Olympus' mountain, Sora, Donald, and Goofy are happy to find themselves reunited with Hercules in the town of Thebes, which is currently plagued by fiery destruction. Hades is of course to blame, so Sora and Hercules waste no time in agreeing to team up to thwart the villain's plans once again. A swarm of Flame Cores then appears and the group puts their new partnership to work to defeat the Heartless nuisance.

Soon the calls of a young girl in distress are noticed by the group, so Hercules catapults Sora, Donald, and Goofy to the girl's location. Here they find another Flame Core swarm, which they dispatch to help get the girl to safety. The trio continues on through Thebes, eventually coming to another group of Flame Cores in the Garden, which they defeat in order to protect more townspeople.

Eventually Sora and company reach a temple on the outskirts of town and run inside to find Hercules holding the collapsing building up on his back, trying to protect a huddle of scared civilians from another swarm of Flame Cores. Sora defeats the Heartless and gets the people to safety, escaping from the building just before it crumbles completely.