Ment
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Did you decide to write from this perspective? I should note that I completed the bosses in a completely different order; I defeated Cthah and Megagremlin as the second-to-last bosses because they are the strongest before the final boss.
By the way, the last boss didn't cause any problems at all; it was clearly easier than any other. After all, my hero was already quite powerful at that point, and I also had support from an ally... Plus, the third-level "demon slayer" spell, which turns your army and (!) your ally's army into an all-conquering war machine, was very effective. Fire spells are completely unnecessary.