“his parabatai rune was bleeding”

“Jem touched the parabatai rune on his shoulder, through the thin material of his nightshirt. "I am not alone," he said. "Wherever we are, we are as one.”

“Will closed his eyes. He could not hear Jem go, not anymore; he did not want to know the moment when he left and Will was alone, did now want to know when his first day as a Shawdowhunter without a parabatai truly began. And if the place over his heart, where his parabatai rune had been, flared up with a sudden burning pain as the door closed behind Jem, Will told himself it was only a stray ember from the fire.”

“We’re Nephilim. Every one of our life’s passages has some mystical component — our births, our deaths, our, marriages, everything has a ceremony and a rune. There is one as well if you wish to become someone’s parabatai. It’s no small commitment.”

“It’s me,” he said, and cleared his throat. “I could understand if you didn’t believe me, but I swear on the Angel, Iz, it’s me.” Alec said nothing, but his grip on Jace’s hand tightened. “You don’t need to swear,” he said, and with his free hand touched the parabatai rune near his collarbone. “I know. I can feel it. I don’t feel like I’m missing a part of me anymore.”“I felt it too.” Jace took a ragged breath. “Something missing. I felt it, even with Sebastian, but I didn’t know what it was I was missing. But it was you. My parabatai.”

“Runes, runes, runes... Runes. An inverted Algiz rune. The caption next to it said “Chernobog.” The Black God. Right. Of course, it wouldn’t be Chernobog, God of Morning Dew on the Rose Petals, but a woman could always hope.”