Boon of Death's Door (5e Epic Boon)
From D&D Wiki
Boon of Death's Door
Prerequisite: Level 6 Grave Domain Cleric
You can now use your "Sentinel At Death's Door" feature from up to 60ft away, and when you do so, the attack's damage is halved.
Additionally, you may cast the spell "Death Ward" at a range of 60ft, and can do so as a reaction whenever an ally would take damage - provided you have the necessary spell slots - once per Long Rest.