Mage's aren't the easiest to take down in gorge! Heres a few tips on mage ( and alches). When you start the game, let your mana go to the 2 bar. Then use lighting. Move it if you don't hit anything. this basically tells you where your enimies are, and your allies might find this helpful, (stun effect) Stone curse is your friend. So is spam. If anyone comes close stay at your collective base. Fire firebolts, with your back to a wall. If they are coming for a charge attack, this will counter and do some damage. Some alche tips are here! Ok, well when you start on the left side, run to the next plaform, the one thats really high. Put the booby traps at both ends, and throw bombs. You are un touch able, and if someone comes,Posion gas or cure works fine. The Triple blocbuster might work too.That way, you might be the last in the battle, and you can use all that mp for the finisher. Back to mage, meator works too. Go to the right lowest plaform and have you back to a wall. Use it, and it'll hit the whole map. For alche in that area, use poison gas,(right lowets plaform) and then booby trap the edge of the next plaform to the left. They can't jump out and you can use bobs or cure like right when the gas dies out, for the best dsah or grab attack. Hope this helps!
P.S. Practice the posion gas mesure when you are on the left hightest plaf. You might fall!