Rider's Champion

Spending Runes has a chance to call forth the aid of a Horsemen for 10 sec.

Mograine
Casts Death and Decay at his location that follows his position and extends the duration of your diseases by 1.1 sec whenever it deals damage.

Whitemane
Casts Undeath on your target dealing Shadowfrost damage per stack every 3 sec, for 24 sec. Each time Undeath deals damage it gains a stack. Cannot be refreshed.

Trollbane
Casts Chains of Ice on your target slowing their movement speed by 40% and increasing the damage they take from you by 5% for 8 sec.

Nazgrim
While Nazgrim is active you gain Apocalyptic Conquest, increasing your Strength by 5%.