Mordecai was born in the fortress of Darkspine on Gehenna, the blasted volcanic plane that serves as a staging ground for the Blood War. His mother was a tiefling camp follower attached to a yugoloth mercenary company, and he never knew his father — only that his bloodline traced back to a pit fiend of considerable power. He grew up dodging fiends, learning to lie, cheat, and steal to survive in a realm where weakness was a death sentence. When his mother was killed in a demonic raid, Mordecai made a desperate pact with a fiend lord named Xarthaxis, trading a portion of his soul for the power to escape Gehenna. He fled through a portal to Sigil, the one place in the multiverse where even the gods cannot tread. Now he navigates the deadly politics of the City of Doors, playing the factions against each other while trying to find a way to break his pact with Xarthaxis before the fiend comes to collect what is owed.