Arcane Siphon

Arcane Tether
You make a ranged spell attack against a hostile creature you can see within 60 feet. On a hit, a shimmering arcane tether forms between you and the target for up to 1 minute (Concentration).

Once per turn while the tether persists, when you deal spell based damage to the tethered creature, your Arcane Ward regains hit points equal to your Intelligence modifier + the level of the spell used (minimum 1 hit point).

If the tethered creature is reduced to 0 hit points while the tether is active, your Arcane Ward immediately regains 2d8 hit points. If you do not currently have an Arcane Ward, you instead gain that many temporary hit points.

The tether ends early if the target moves more than 60 feet away from you, you lose concentration, or the target has total cover from you at the end of your turn.