Immortality

Vodlemort wishes for immortality and a whole soul, so he give Severus a task to complete. Can five world class Potions Masters and one Elder Shen-lung help put an end to the Dark Lord? They will try because there is no way for Severus to succeed in the task, and the Potions Masters refuse for him to die. If you add in one Headmaster and ex-Dark Lord do their chances increase?