Remnant is basically life force, and can be used in multiple ways from enhancing and enchanting items, using it as power, as a form of immortality, or reanimation.. Quaint is this is a very powerful substance that can only be extracted from the last Blood of a dying entity, the last blood has to be right at the final heartbeat when extracted after that heartbeat it turns back into normal blood, this Remnant in it's raw form is a very vibrant, glowing so violet. It also gives life to Machinery and may lead to some possessions, of course I can be extracted by Magic but it effectively kills the entity it's extracted from whether it was plant-Based, flesh and everything in between so long as it's alive it can be extracted from