This is a summary of what is ‘known’ in Reyern at the time of play. It may or may not be correct.
Magic is a bit like light. It pours into the world in what seems to be a single flow, but looked at in the right way it is made up of different elements. These are known as streams.
Source mages say that the eight streams enter the human body at the base of the spine. It then flows around the body in a similar way to blood.
Not all humans have the capacity to absorb magic in this way. Those that can are known as mages. Some are born with the capacity, while some develop it later in life. This is known as ‘expressing’ magic.
Mages can access every stream at some level, but most mages have an affinity for one or two streams. To a Source mage it appears that those streams are stored more efficiently by the body. In the same way that a trained runner develops larger muscles, a trained Fire mage develops a greater store of Fire magic within their system.
There is a limit on how much magic the human body can process. Thus, mages who have an affinity for two streams can store half as much power per stream than those who specialise in one stream.
Mages cannot store magic from more than two streams. Experiments with increasing the innate storage capacity of the human body result in death or madness.
A mage can share expressed magic with another mage. This is known as bonding.
Groups of mages can cooperate with each other to create large effects. Certain magics work particularly well together.
Magical creatures are born with magic in their blood. It neither enters nor leaves the body and cannot be taken away. Unlike expressed magic, innate magic cannot be shared. The only exception to this rule is dragons, who can form a bond of sorts with a human partner. This does not allow the sharing of magic, but does allow a sharing of thoughts and feelings.
Download the current magic system document: Lifeblood LARP PC System V3