Death Weapon Cursing

You were cursed by Death or any powerful undead creature with necrotic powers that are slowly consuming you. After every long rest, you receive 1d6 necrotic damage that will reset the next long rest. But, with this curse come 3 powers that make you somewhat powerful.

Soul Banish: You can kill any creature that you can touch instantly, no matter the size. Afterward, you shall receive 1d6 permanent damage (your hp is now 1d6 less) + 1d6 necrotic damage.

Soul Extraction: If you kill a creature and it happens to have a jar nearby, the soul goes to the jar. Afterward, you shall receive 1d6 permanent damage (your hp is now 1d6 less) + 1d6 necrotic damage.

The Weapon of The Dead: Chose a weapon. Every single creature within 200ft of you dies including you. If you have a soul in a jar you can spare anyone's life in the process, leaving said person or creature with 1hp, forever. The weapon you chose now deals necrotic damage and is a +(the number of dead creatures). Every +10 is replaced with an ability that's related to souls, undead and necrotic damage. Said abilities need to be given only to the wielder. After using it, if you don't die, the curse is gone.