Shadowrun: Legends: Worlds Without End

Spawned in the realm between the worlds, a Horror comes. Defeated in battle centuries before by the elven mage Aina, it walks again, seeking vengeance on the mortal lands. If Aina fails to convince the courts of Tír na nOg and Tír Tairngire of the danger, she will have to face the Horror alone once more--or watch the world end.