With an echoing clang, Kadaith weapon glances off one of the devils horns. For a moment, it looked as though he has overextended. With astounding effort, Kadaith regains his balance and turns his momentum into yet another bone-shattering cleave.
No Action: Burn my Combat Surge to force a reroll of the first attack roll.
Attack vs AC - (1d20+24)
Second attack is a crit
Untyped Damage - (3d6+27)
16 Fire damage
10 Cold damage ongoing (Save ends)
Edit: Burn my Heroic Effort as well for a +4 if it's still a miss.