The initiation at the magic school uses a measurement of your abilities presenting a status table. With Slayer I got
Output: Excellent
Refinement: Coarse
Endurance: Extreme
Alignment: Contained Chaos

The different paths to initiate into are valued using a level system indicating their difficulty. Although the magic circle is safe, one must finish the task or fail the task. Applicants are only accepted for tests they are estimated to have the ability to finish, but sometimes a person will use up all their life force because they do not use their energy effectively.

When I re-registered as myself, I got the same stats as Slayer, but
Alignment: Bound Chaos

This is a less directional form of chaos which is simply "bound within the body", while Contained Chaos is bound to the spine, so Slayer is narrower.

To learn Chaotic Black magic, one needs to have
Alignment: Unbound Chaos

which is external to the body. Otherwise the energy output will be too low no matter what one does. Chaotic Black magic is graded at level 6.