Promise

Neither Luke nor the demons under his command had a chance to react to my spell., soulcast as it was. By the time they knew I'd even cast it, his soul was wrapped in the threads of my mana. He stumbled back and clutched his head with a single hand as his eyes turned gold and dozens of stars began drifting through his pupils.

"Damn it, filthblood!" Gayron shouted, raising his hand and charging another technique. "You dare launch an underhanded strike at a time like this?"

This time, he seemed intent on directly killing us, using a sixth-circle magical technique to bypass my resistance. Korra leaped in front of me, channeling one of her defensive magic arts to soak the attack, but the world slowed before the attack left his hand.