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I'm playing as a Hero. In the 4th mission, on week 3, I encountered a demon with armies of 200-300 units each. This made me question my build, as spells dealing 1-2k damage become useless. A more viable branch is definitely the Tears skill tree, as it provides both summoning, healing, and damage reflection! I noticed that the AI focuses on only one unit, and with a 1k power healing spell, enemy units will kill themselves against your "tank," and the racial ability also provides damage reflection.
How do you develop your Warrior/Mage?