Clerical Work: Specialty Priests of Loviatar for D&D 5th Edition

I'm importing the idea of Specialty Priests and channeling a bit of DnD 4E by treating them as Feats.

Specialty Priests of Loviatar

Pains Feat

Prerequisite: Cleric with Death Divine Domain

• You can add half your proficiency bonus, rounded down, to any Constitution saving throw that doesn't include your proficiency bonus.

• You learn the thorn whip cantrip.