Mord is a minor villain in A Song of Ice and Fire and Game of Thrones. He serves as the gaoler of the Sky Cells in the Eyrie.
Mord is the brutish and vicious jailer at the Eyrie who tormented Tyrion Lannister and, evidently other prisoners. He is in charge of the upkeep and maintenance of the sky cells of the Eyrie.
The almost saintly aura which surrounds Jon Arryn should perhaps be tempered by the fact that he long employed, and presumably approved of Mord.
Tyrion Lannister is given into Mord's redoubtable care while a prisoner at the Eyrie. While Tyrion is trapped in the Sky Cells he tries to bargain for his freedom. Mord responds by beating him because he has no money to pay with. With great difficulty, Tyrion manages to bargain with Mord to allow him a fair hearing with Lysa Arryn, under the promise "a Lannister always pays his debts". Tyrion is able to manipulate the situation during his audience with Lysa to demand a trial by combat, which is won in his favor by Bronn. Set free, Tyrion asks for his money-purse back from Rodrik Cassel. As Tyrion turns to leave, true to his word, he tosses the gold-filled purse to Mord, who looks back in delightful astonishment as Tyrion exits the Eyrie.