Death Wish

You touch a trinket mumbling words of dark power, embuing it with necrotic energy, the trinket then floats up dark purple strands of swirling smoke trail it onto a willing creature, where it remains until the spell is dispelled or the creature dies.
The trinket used as the material component cannot be affected by transmutation magic while the spell is active.
While both active and the targeted creature and the caster still live, the creature wearing the trinket has vulnerability to all damage and cannot benifit from any healing or the effects of both long and short rests.

The creature affected by the spell acts under its own will and is no different in all appearances to the naked eye. (A detect magic, identify or similar spell reveals the spell and its effects)

The creature also has advantage on all attacks it makes and on each successful attack it may use its bonus action to add 7d10 necrotic damage to the hit.

When the creature dies it cannot be raised as an undead.

Greater restoration cannot end this spell.
Any magical means of ending a spell imediately ends this spell and any of its effects.

At higher levels, each spell slot level above 5th the extra necrotic damage dealt by the effected creature increases by 1d10.