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I've captured all the castles. I just can't seem to deal with 46 avatars, each of which has 15,000 hit points.
They simply wipe out all my troops.
I can't just sit behind the castle walls – with the very first volley, the catapult breaks through the castle gates and walls, and the avatars rush through the breach, and the slaughter begins.
I can handle other troops without any problems.