Amulet of Heartrime

 is a unique amulet and artifact equipped by Dagoth Endus, an Ash Vampire and kin of Dagoth Ur. It is enchanted with the power to increase the wearer's Magicka supply, Conjuration skill, and chance to evade physical attacks.

Enchantment
Enchantment ID: ward of endus

All effects are for 30 seconds on self:
 * Fortify Conjuration – 20 points
 * Fortify Magicka – 30 to 60 points
 * Sanctuary – 10 to 20 points

The Citadels of the Sixth House
The Nerevarine battles Dagoth Endus at Endusal in the Red Mountain region near the conclusion of the main quest, in an effort to weaken the patriarch of the Sixth House by slaughtering his kin. Endus uses this amulet during combat, and it can be acquired from his remains when he is killed.