Dark Succor

Censure a creature you can see with a dark reprimand. The target creature must make a Wisdom saving throw for this spell to succeed, and if it fails the saving throw it is afflicted with a magic mark created by the caster. This mark lasts one hour & for its duration, half of any hit points, rounded down, the afflicted creature loses during that time are gained by the creature that caused it to lose those points. (For example, a wizard hits the afflicted target with the Fire Bolt Cantrip for 8 hit points worth of damage, causing the marked creature to fall unconscious. But the target creature only had 6 hit points, so the wizard that cast Fire Bolt gains 3 hit points.)

If the afflicted target is healed by another creature, the creature that caused the afflicted target to gain hit points, loses the same amount of hit points the afflicted creature gained, for the duration of the mark. (For example, the afflicted target's ally uses Cure Wounds to bring it back up to 6 hit points, its maximum hit point value. That ally would then lose 6 hit points.) The mark this spell creates has no effect on hit points the afflicted creature gains from its own spells or abilities.

This spell has no effect on constructs or undead creatures.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the duration of the mark created by this spell becomes 1 hour.