As raid-goes progress through the Lich King's lair, IceCrown Citadel, the Supreme Overseer of the Cult of the Damned, Lady Deathwhisper, is the second boss encounter of the raid. Consisting of two phases, Lady Deathwhisper will test the awareness of all raid members as well as the raid's overall DPS output. Having a significantly high DPS output will make this fight much easier.

Depending on the phase, Lady Deathwhisper will have different abilities. Knowing and understanding her abilities for each phase is the most important part of the encounter.
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