Chrono-regression (5e Spell)
From D&D Wiki
|3rd-level Transmutation (ritual)|
|Casting time:||1 action|
|Components:||V, S, Mgp (a pocket watch worth 1500 gp)|
Touch a creature; if they lost hit points the past round, they regain 4d4 hit points. If they regained hit points the past round, they take 4d4 necrotic damage, but can take half damage instead of they succeed on a DC 16 Dexterity saving throw. If they were neither healed or damaged last round and is a friendly creature, they regain 1d4 hit points and restore a spell slot of 2nd level or lower. If they were neither healed or damaged last round and is a hostile creature, they take 1d4 necrotic damage and lose 2 points in their highest ability score for the remainder of the encounter.
At Higher Levels. When you cast this spell using a spell slot of 4th or higher, the amount of hit points regained increases by 1d4 for each level above 3rd, and the amount of damage taken increases by 1d4 for each level above 3rd. The max level of spell slot you can restore increases by 1 for each level above 3rd, and the number of points lost increases by 1 for every two levels above 3rd.