Umbral Aura

A misty veil radiates from you, masking you and your companions from detection. For the duration, each creature you choose within 30 feet of you (including you) has a +10 bonus to Dexterity (Stealth) checks and can't be tracked except by magical means. A creature that receives this bonus leaves behind no tracks or other traces of its passage. Upon leaving the range of the spell, or if the spell ends, a creature affected by it must make another Stealth check at disadvantage as they suddenly become more visible. When cast at higher levels, the duration of the spell increases by one hour per each level above first.