Boon of Exquisite Radiance

Boon of Exquisite Radiance
Feat
Prerequisite: Level 19

You gain the following benefits.
Eternal Rest.
Creatures you reduce to 0 Hit Points can't become Undead.
Powerful Radiance.
When you make a damage roll that deals Radiant damage, you can instead use the highest number possible for each damage die. Once you use this benefit, you can't do so again until you finish a Long Rest.

Source: Forgotten Realms: Heroes of Faerûn (FRHoF), page 42