Soul Sheath

2-level Necromancy (ritual)

You fragment a bit of your soul off into a melee weapon that you are holding, sheathing it with ethereal energy. When you cast this spell, you take 2d4 soul damage, and your hit point maximum is reduced by the amount of damage you took (this damage cannot break your concentration for the spell). For the duration, the weapon you cast the spell onto deals an additional 1d10 force damage. If the weapon leaves your grasp the spell ends.   When the spell ends, the reduction to your hit point maximum caused by the spell ends.
At higher levels: When you cast this spell using a spell slot of 4th or 5th level the soul damage you take increases to 4d4, and the force damage the weapon deals increases to 2d10. When you cast the spell using a spell slot of 6th or higher, the soul damage you take increases to 6d4, and the force damage the weapon deals increases to 3d10.