Bladebound Hex

You imbue a curse within your blade, speaking a command word during the casting. Once activated, the curse contained within the blade will corrupt the essence of all targets from whom it draws blood.

Until the spell ends, you may speak the command word as a bonus action to activate the ability. For the next 10 minutes, any successful attack made with the blade will deal an additional 1d6 Necrotic damage.

Any targets brought to 0 HP by an attack with the blade must succeed at a Constitution saving throw against the caster's Spell Save DC or immediately die. If the target fails their save, the curse is reset on the blade with the same command word activation for the next 24 hours.

If the caster is using their own blood to cast the ritual, the lose HP equal to 2x the spell slot level used, which cannot be regained until the spell ends, or the ritual is recast with other blood.

Any spell that removes a curse will end the spell on the blade.