Iron Storm. Stormspire, #2

The Iron Cup is supposed to be a game. But when real blood starts spilling, Kal Stoneveil realizes the rules have changed. Now leading a squad of Stormspire's most difficult students, Kal faces a gauntlet of team-based challenges: capture the flag in a monster-infested ruin, siege warfare against the Ashen Pyre, and a final battle royale. But the real threat lurks in the stands. A Sect elder recognizes Kal's forbidden power, the Omni-Path, and puts a bounty on his head mid-match.
Caught between a rigged tournament and an assassination plot, Kal must forge his squad into an unbreakable unit or watch them be picked off one by one.