Cluster

Cluster (クラスター) is an Ultimate Move performed by Katsuki Bakugo using the Explosion Quirk.

Description
Katsuki condenses his explosions, so instead of letting off a singular explosion, he lets off a barrage of much stronger explosions, which can be used in a variety of ways. He describes the attack as being one he can do when he feels he's in a sensation of total crisis. He later figures out the best approach to execute the technique is by storing up a bunch of sweat so he can create the barrage of explosions rather than just one big one.

Cluster is first used inadvertently, in the form of a mobility move, by Katsuki to defend Izuku Midoriya from Tomura Shigaraki during the Paranormal Liberation War. Also during the War, Cluster is used again in the form of the same mobility Ultimate Move demonstrated before to help Best Jeanist. Both Cluster and the mobility move get their names, with the move being named "Blasting Speed Turbo: Cluster," when they are used in an effort to bring Izuku back to U.A.

The second application of Cluster is used in the form of Howitzer Impact: Cluster. This time, Cluster is used offensively and in combination with the Strafe Panzer support item to provide a more powerful attack, as well as a spray of explosions in multiple directions.