Anataraxis

Anataraxis — the least of Sceeva's brood, though still a mighty red dragon in life who achieved 19 hit-dice before her transformation. In undeath as a dracolich, 'Anna' — as some members of the Cult of the Dragon affectionately call her — has the following stat-block:

Apply the dracolich template to Anataraxis. This particular dracolich may attempt Necropivot once per combat encounter, and up to three times between long rests.

Though temporarily defeated by the Phandalin Four in the Barrow Bog, Anataraxis' phylactery wasn't destroyed, so she will reform and again menace the region of Stigrix.