That's because they shoot. Titans are the strongest monsters in the game. I defeated five Titans with five Lava Golems without any upgrades. First, I shot them, then I hit them with lightning when they got close, and I didn't take any damage in return and didn't lose health from the fire. It worked great. Besides, Titans are not susceptible to mind magic and are the strongest ranged attackers of all the Heroes factions.
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