Drain Vitality

Make a melee spell attack against a living humanoid. On a hit, the target must make a Constitution saving throw. If the target fails this save, they are paralyzed for the duration. At the end of each of its turns, the target can make another Constitution saving throw. On a success, the spell ends.

As a part of this spell's casting and on each of your subsequent turns, you can use your action to drain vitality from the target. When you drain vitality from a target, it ages 1d4 years and your physical age is reduced by the same amount, to a minimum of 21 years. You cannot drain vitality from a target while your physical age is 21 years or younger. The spell ends if you are no longer within 5 feet of the target, or you use your action to do anything else.

The aging effect inflicted on the target can be reversed by a greater restoration spell, but only if it was cast within 24 hours of it occurring. If the target's age is reversed before the 24 hour period, the caster's age is also reversed by the same amount.

Once 24 hours have passed the effect becomes permanent, and can only be reversed by a wish spell.