Viktor's Brand Of Undeath

You focus your necrotic energies to brand yourself with the mark of undeath. All of your vital systems are bypassed whilst this spell is in effect, and you become undead.

You are immune to the poisoned, paralyzed, disease, stunned, sleep and instant death effects. Additionally, you cannot be subjected to critical hits, nonlethal damage, ability drains, energy drains, fatigue or exhaustion. You are immune to any effect that requires a CON save, and do not need to breathe, eat or sleep. In return, you cannot heal (unless damaged by necrotic or poison damage or gain life via negative energy, such as life drain from vampiric touch), are affected by spells that affect undead creatures and have disadvantage on all CHA rolls whilst the spell is in effect. Ending this spell requires an action.