Mana

Mana was a form of raw magic utilized by bloodforges and mages of the Utter East. It was also known as spell power.

Philosophy
This raw magic was called "mana" by adherents of the Great Mage, who taught a number of principles of warfare related to the function and philosophy of the bloodforge and its use in battle. They saw mana as a kind of food that fed the bloodforge and their war effort.

Generation & Storage
Owing to its own magical nature, a bloodforge slowly generated mana and could store a large amount of it collected from other sources (though this had a maximum limit). All a mage's mana was stored in their bloodforge.

More mana could be generated in various ways. Most commonly, a basal golem (created by a bloodforge) that sat idle meditated in the form of an obelisk and gathered mana, which it then transferred to the bloodforge in pulses once a certain amount had been accrued (but less could be transferred early). However, the goblins of the Kingdom of Nix developed great cauldrons that would cook and stew a creature and yield mana to its owner.

Mana orbs, gray spheres of magical energy, could be found that bestowed an instant burst of mana to one who touched them.

Sacred urns, when carried by a slain creature, conveyed their essence in the form of mana back to their leader.

Applications
With the power of a bloodforge, a mage could turn a portion of its mana into a kind of living golem called a basal golem, utterly loyal to the bloodforge's owner. Mana was also used to transform basal golems into higher-level creatures, to cast spells, and trigger magical items. It could also be used to heal a creature when adjacent to the bloodforge.

Background
Mana is of course the ubiquitous system of mana points that fuel magic in countless fantasy roleplaying and video games. This derives from mana, a Polynesian and Melanesian concept of supernatural power, influence, or prestige. However, the text of the Readme file for the Blood & Magic (for the Interactive Demo only) says "We of the faith call this power mana, the food which nourishes our practice." This connection to food suggests instead manna (also spelled "mana"), a magical food in the Bible; the two concepts may have been conflated by game writers.

In-game descriptions appear to treat mana as a form of life energy, being used to create living golems, heal them, and transform them, and this mana can be gained from their deaths (in the sacred urn or cauldron). This is supported by the use of "blood" in the bloodforge and the game's name. However, it is unknown if all living creatures contain mana or if it is only golems that are simply reverted to their raw magical state. Since non-bloodforged-creatures exist as neutral units, and these may be harmed the same way, the former case appears to be true.

Dungeons & Dragons rarely uses a magic points system, so mana does not appear to be mentioned anywhere else in the Forgotten Realms. Nevertheless, it is hinted at in the name of the Mana Forge in Baldur's Gate II: Throne of Bhaal, though the connection to mana is unclear.

Finally, mana bears a close resemblance to incarnum as described by Eytan Bernstein in the Class Chronicles: Incarnum article, as a Weave-related raw magic that permeates the world (rather than the soul energy it is Magic of Incarnum) that can be shaped into magical objects.