Overview: The fel reaver's cannons continously alternate between
[Annihilation] and
[Decimation].
Upon reaching 65% and 25% health, the fel reaver activates its
[Apocalypse Drive] exposing its weapon platforms. Unless one of these weapons is destroyed before the cast can complete, the party will be eradicated.
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On Mythic difficulty, the cannons can no longer be destroyed, but instead go haywire, granting the cannons additional effects.