Mistweaver PvP. Necrotic Aura can be played in 2s for the additional damage.

Order of Embers. Epidemic should always be taken as it can be used to prevent healers from drinking by keeping them in combat as long as your disease is on them.

Notably Temporal Shield can be utilized for, functionally, an extra 6 seconds of combat time against large elite mobs. Patch 8. Death Knight.