This is by far the most interesting profession you have yet posted Olf. There does however seem to be the same powerproblem that there was with the first ones you created only with the hunterkiller the costs are also tweaked to an all time low for a semi spell user. Could you try to explain why your classes are so powerful and how pure arms classes fare in your campaigns i.e. if they are compensated in any ways etc.
First, power is a relative matter and balance is IMO a ridiculous consideration.
Complaining that a spell list is too powerful is similar to saying how a gun is too powerful compared to a sword and shouldn't exist, or that the atomic bomb is unbalanced compared to the conventional missiles and shouldn't exist.
Of course, it's unbalanced: it's the very purpose of creating new technologies, including weapons, creating ones more powerful than the previous. At last, the creation of a tech./weapon doesn't automatically cancel the usefulness or existence of the previous ones.
Complaining that a profession is too powerful (and shouldn't exist) is similar to complaining that being a nobleman in medieval times is so much better than being a commoner. The answer is 'yes', it is, yet it did and should exist.
I create my professions according to concepts; as long as a concept is valid to the world, the profession is valid --and "raw power" isn't what determines whether a concept is valid or not.
There are more IMO to roleplay and usefulness than raw written abilities, and when I did have players complaining about another player's being "too powerful" or "too useless", it
never had been because of their respective professions, but of the mentioned player's way of playing his character. The most powerful character I ever had in a (sci-fi) game was a mere student (whereas the others were secret agent, special police enforcer, experienced bounty hunter, etc.) with close to zero skill (he was of the slacking off type and never really studied...) but with close to unlimited money, a lot of relationship, and access to virtually anything because he was the single son of the owner of the most powerful corporate of the world.
As for pure arms professions, they exist and are by large the most common encountered professions by the mere fact it's easier (in every way: easier to learn, less expensive to become [study of magic is expensive!], easier to find tools of trade, easier to be accepted [i.e. anyone can become one, without much requirement as far as social class, physical or mental attributes, money, etc. are concerned). Now, if you question was about why would a player play a pure arms rather than a spell caster, as my merchant PC said to the Noble-Warrior: "Sure, you have muscles BUT I HAVE MONEY! That, and I prefer not to be hurt every time there's a fight."
Also I think you are too kind when allowing essence users access to concussion ways as they thereby get aces to actual functional healing which is the one drawback of essence.
You later answered your own question.
I explain my concept of magic in my
world forums but, in a nutshell, I don't classify spell lists by realms, but merely by learning difficulty (so you have open, closed, base and "arcane") with the realm of a spellcaster being the indication of how he gains his magical energy, not of what he can do.
That being said, for the purpose of posting here, I assigned a realm to my profession but the Fire Mage can actually be an Essence spellcaster, a Channeling spellcaster, a Mentalism spellcaster, an Elementalist spellcaster, or an hybrid spellcaster, just all the same.
Let me just mention that I really like your idea and it seems to me to be a nice piece of work before I go on 
Thanks. Does that mean I shall get to see your own creations?
Mana currents is an issue to me as well as it is not only SO poorly written and balanced that it is useless as a serious addition to the spell repertoire the attack tables are also full of flaws and typos and thus it was only in use for a few years before it was cast aside.
I know this is a lot but could you possible design a new list around the spells you invented yourself without the use of the lightning ball attacktable?
...it's easier to rewrite the table, what I did.
