The player must complete the Four Horses of the Apocalypse challenges. After taming all four Horses of the Apocalypse and killing one of every type of undead with Death's ability, the player will unlock the Blood Pacts. Also, the player will receive a Blood Pact for Death once they complete the game, even if they already had one. (This means the player can have two Blood Pacts for Death).
These pacts work much like Horse Deeds. The player simply selects one of the pacts from the inventory to activate the associated horse. After doing so, whistling will call the selected horse to the player.
Pestilence is a white horse with patches of black spots on its body and bloody eyes and limbs. It is diseased and always has a green miasma following it.
Death is a black, tan, and white horse with a mist always following it. Death kills any undead it comes in contact with
War is red horse that causes any undead it comes into contact with to be set on fire. Its feet, tail, and mane are always on fire.
Famine is surrounded by locusts that follow it wherever it goes. It is black with a patch of white by its tail.
Pestilence, Famine, Death and War stand side by side