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It takes a little bit of getting used to since you can't get it until you're in the level 11-13 range (depending on when you finish the first part of the game in Haven) and until that point you've been playing a typical ranged mage and with KE you have to switch to melee range, but god is it ever fun!
To start off you can turn 30% of all damage you do into a barrier for yourself. This means you can always have a pretty hefty barrier up...even if you use half of it to power fire spells.
You also have one of the most unique and fun spells I've ever seen: Fade Cloak with Decloaking Blast. What it does is makes you invulnerable for 2 seconds and you can pass through enemies, The fun part comes in, if you time it right, when you decloak inside an enemy dealing 1,000% weapon damage... I've killed 3 dragons so far fighting right under them It also only costs 20 mana so it's almost always up.
Spirit Blade is your spammable melee damage that does 400% weapon damage with extra damage against barriers and guard. The enhanced version also gives you projectile deflection doing damage to whoever is shooting those arrows at you.
For my other damage I'm using Immolate and Fiire Mines with the fire passive Chaotic Focus that uses 1/2 of my barrier at the time I cast it to add to the already hefty damage.
I only have enough points at this time to get one other spell that isn't fire or spirit and I'm using Winter's Grasp for very fire resistant mobs.
And the special focus ability, Resurgence, is also very handy as an "oh shit" button. It does a mass rez on all downed companions plus a HOT for 10 seconds of 2%, 10% or 25% health per second depending on your focus tier (I have mine unlocked to tier 3.)
I'm not finding melee in real time that tough to stay on target (I am planning on adding Fade Step soon though to help with mobs that jump around a lot) although having the auto-pause whenever I cast either of my 2 fire spells gives me enough time to give orders to my companions... if they need it... I actually find the AI for them to be good enough that usually all I do Is get them to drink a potion, cast a barrier or taunt.
IMHO, by far the best mage specialization.