Josh said: By that logic nathanial shouldnt be able to heal passively or by rest ingsince he is imbalanced with more negative energy. I was wondering if anyone would ask about negative-attuned creatures. :P So undead are basically a perversion of living creatures, intended to turn the normal cycle of life inside-out. With an undead creature, its lifeforce (some scholars instead refer to it as an 'unlifeforce' instead) harvests negative energy from the environment instead of positive, which leads to their bodies having a high concentration of negative energy and very little positive, the opposite of a living creature. So, why don't undead just rot away to nothing? This is where it gets really messed up. The unique thing about undead (and the key mechanism which allows them to exist at all) is that it's not just their energy attunement that's reversed, but also the way energy affects the relationship between their bodies and their environment. Normally, negative energy entering a living creature from outside causes it to decay while its environment becomes relatively healthier (though the latter is less noticeable, since it's spread over a larger area). But for undead, this result is inverted: when negative energy enters an undead from outside, the decay is applied to its environment while the increased health is applied to its body. This sounds really weird, and it is. It's why pumping negative energy into undead heals them, and why the reverse also works: positive energy normally heals a living creature, but since undead have a reversed energy relationship with their environment, the repair effect of the positive energy applies to their environment while the decay effect applies to the undead. Keep in mind that for spells like cure and inflict wounds , the energy is conjured from the Inner Planes, so the effect on the target's local environment is negligible. In rare cases, living creatures (like Nathaniel and Corvus) can become attuned to negative energy just like undead, usually through the influence of powerful (often divine) necromantic magic. Their bodies then work the same way, though they often end up rather sickly because of the attraction of evil particles to their bodies (undead just can't be harmed by diseases because they don't have working organ systems, so it's not a problem for them). That's also why undead can never really be good, though: the high concentration of negative energy in the bodies, made stable and mobile by their reversed energy relationship, means that they become agent carriers of more and more evil over time. Josh said: and on the astral sea that life force that was just floating around was just + and - energy mixed and unable to diffuse? could one create more life force by mixing the 2 ? In that case, it was more because of the weird way time works in the Astral Plane. A lot of gradual passive processes, like decay and growth resulting from negative or positive energy, are simply paused while visitors are there (though this can be overriden with magic). So the stray threads of life force you encountered in the corpses were just unable to fully break down and dissipate because entropy couldn't function normally on them. To this second question, no. Life force isn't really made of positive or negative energy, and in a sense isn't made of any thing at all--it's more like a conceptual infrastructure that moves energy around, and uses this flow to allow the soul to control the body.