Repels Mavra

"Harry!" Michael shouted. "Look out!"
I looked up to see Mavra bound up onto the dias again, not bothering to take the stairs, landing a few feet from me. Michael strode forward, one hand holding a dagger up reversed, point down, a cross extended toward Mavra. The vampire flung her hands at Michael, and darkness spilled out of them like oil, splattering toward the knight. It sizzled and spat against him, going up in puffs of steam, and Michael came on forward through it, white fire gathering around the upheld cross. Mavra let out a dusty, hissing scream and fell back from him, forced away from me.
"Harry," Thomas shouted up the stairs, "hurry up! We can't last much longer!"
My eyes swept the dias, but I could see no sign of Bianca or her attendants in the shadows cast by the halogen-brightness of Michael's blazing cross. I hurried to Lydia, sheathing my slender blade before scooping her up. "Longer? I'm amazed we're still alive now!"
"Light shines brightest in the deepest dark!" Michael shouted, a fierce joy on his face, his eyes alight with a passion and a vengeance I had never seen in him. He kept forcing Mavra back before the paralyzing fire of the cross, until with a scream she fell from the dias. "Let come the forces of night! We will stand!"


Grave Peril Chapter 30, Page 320