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Rampage (NPC Ability)
The NPC will perform an attack round on one extra player other than main tank. Depending on the encounter, you will have to learn how to deal with it. It can go from healing the small damage (Vindicator rampages rarely, for example) to other strategies (Arch Lich rampages every round). Rampage is mapped to a second list (Rampage list) that is based on aggro. The first person on the list will always get hit by the Rampage attack, unless that person is charmed or decides to zone. If the person on top of the Rampage list gets out of melee range, the next person on the Rampage list will get be hit.
Feign Death will remove your character from the Rampage list.
Rampage and Flurry are mutually exclusive with very few exceptions; i.e. if a mob rampages, it won't flurry and vice versa. Enrage is common for many high-level (55+) mobs and even high-level pets.