Mana For the living, luck comes “like mana from heaven.” Thus the term: Mana. Mana is replenished in tiny but constant amounts when a living being is resting.

Quintessence For many mages their needs for magical power outstrips what mana they could collect naturally. Necromancers have devised ways to extract mana from life forms, concentrate it, and store it for ready use. Some collection practices are somewhat benign and sustainable. (Akin to tapping a maple tree for syrup.) Others are a bit more violent, if not viceral:

Vampire access the Vishuddha chakra by piercing his victim’s corotid artery
Illithids access the Sahasrara chakra through a victim’s skull and brain stem.
Shemyaza access the Manipura chakra through the victims genitals or through the abdomen.

Quintessence For many mages their needs for magical power outstrips what mana they could collect naturally. Necromancers have devised ways to extract the mana from life forms, concentrate it, and store it for ready use. Some collection practices are somewhat benign and sustainable. (Akin to tapping a maple tree for syrup.) Others are a bit more violent, if not viceral. (See: Illithid, Shemyaza, Vampire, and Wendigo). Constructs are powered by energon.

Fortune Tegic Mechanic In times past, combat was considered the primary element of survival. Characters would receive actual blows, and it would take several to strike a man down. Those that could withstand the most blows were considered to be made of sterner stuff. Thus the archaic term Hit Points. Today, with guns, direct damage spells, failures of complex life support apparatus, and supernatural beings who can smite with a thought we have recognized that survival is about luck. Characters can draw on Mana or Quintessence for fortune. The two forms of energy are considered interchangeable. Living creatures generally use Mana. Construct and Undead creatures generally use Quintessence. Necromancers use both.