Cover of night
Force powers not on charcter sheets
Dark symbiosis requires the alter feat and minimum of 10 ranks in lightning,as well as a charisma ability score 15 or higher.It takes one full round action to do even with high force mastery. The user drains 1d4 wounds from himself or other characters to gain vitailty based on the chart below
Doing it to another character requires physical touch and must beat a Will save (if player has a fortitude feat they may instead use a fort save.