For everything except the area just summon as many liches as you can. For the final battle, spam lightning storm until it's over. The mother trees in Edhel Woodlands go down pretty quickly with lightning storm if you have trouble using liches. ENERGYMAX (templar's) and COMMAND (commander's - duh) are the most important types of equipment, they let you start off immediately with a bit army of liches. Always keep the "Summon ______" skills in your skillset even if you aren't using them or else you don't get the extra command.
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