Orrian Apocalypse
5 players total in game. One player starts as a “zombie” from Orr. Give that player a green aura or something.
Everyone else is on a team against the Orrians. When a Tyrian is killed, he becomes an Orrian. If the Tyrians survive a certain time limit, they should receive a reward. If the Orrians destroy the Tyrians, the first and second to become Orrians should receive a reward.
Obviously, 1v4 is not going to be very easy… so, grant Orrians a stacking buff similar to borderlands bloodlust. It could be stacked every time an Orrian dies, or for every 10k damage done by the Orrian, or for every 30 seconds an Orrian is out of combat. This buff should reset every time an Orrian scores a kill.