I don't know the skill tree for the mage but, it might be more reasonable for advanced skills to Branch in the direction of a necromancer. On that note though if, there were to be more classes added. I would enjoy seeing something like a Vannari Druid. That could be fun. Although, both classes could really just be that of a mage with a summoning specialty for the necromancer, or elemental spell focus for the Druid.