Resistance

You touch one willing creature. Once before the spell ends, the target can roll a d4 and add the number rolled to one saving throw of its choice. It can roll the die before or after making the saving throw. The spell then ends.

The spell's no longer requires concentration at level 5, the spell lasts for 10 minutes instead of 1 at level 11, the spell gives 2d4 instead of d4 at level 17.

Classes: Artificer Revisited, Cleric, Druid, The Witch, Witch

Subclasses: Divine Soul Sorcerer, Nature Cleric, Giant Soul (UA) (Stone) Sorcerer

Subclasses (legacy): Favored Soul v2 (UA) Sorcerer, Favored Soul v3 (UA) Sorcerer

Source: PHB, page 272