I've noticed they tend to be energy draining in nature.

[Hakkai would know more about their exact properties. Discerning Eye can be very hit or miss on magic and associated energies from other worlds, and the additional sensitivities that come from being a Caster can only tell him so much.]

Those energies tend to be directed inward mostly, suffusing the body, instead of outwards to affect the environment. The flow doesn't seem to be as controlled as I'd like to see either. It is difficult to say, given the variations on what is the norm between the people here - but it seems imbalanced...

[You can see where he's going with that.]