Keys on Marquis are by Michael Crouzat (who went and animated on 1s).

Keys on Caldarius and then Rath's first appearance are by Walter Mazoyer.

Keys on Oscar Mike are by Julien Chheng.

Keys on Rath's second appearance are by Braden Poirier with secondary keys by Zhou Q.

Keys on Mellka are by Ulysse Malassagne, who you might recognize from the Kairos trailer.

Keys on all explosion FX until the final shot are by Jeffrey Lai.

Keys on FX in the final shot and bullet FX in all prior shots are by Jay Luo.