Crimson Bolt

You transform your blood into vile, necrotic energy to strike at your enemies. Roll 2d6 and take that much necrotic damage, then lower your maximum hit points by half of that amount. This reduction lasts until you finish a short rest. You then make a ranged spell attack roll against a target you can see within range. On a hit, the target takes 2d6 necrotic damage, and you regain hit points equal to half the damage dealt. If you would heal from this spell above your hit point maximum, you instead gain that excess healing as temporary hit points. These temporary hit points replace any temporary hit points you may have, unless your existing temporary hit points are higher.