Veil of Departed

You summon a swirling shroud of ghostly souls and deathly mist, creating a 20-foot-radius sphere centered on a point you choose within range. The area becomes lightly obscured and filled with spectral forms whispering in dead tongues.

While in the area:

Hostile creatures have disadvantage on Wisdom (Perception) checks and can't regain hit points through magical means.

All creatures treat the area as difficult terrain unless they are undead or constructs.

You and your allies can see through the veil normally, as the spirits part for those marked by death (you choose who is unaffected when casting).