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I took three Giant Nests, two of them on the first try, and didn't take the third at all – it's still the most expensive Castle in the game, and I was already desperately short on money. I upgraded to Titans on the second try. I see that my opponent is heading to the center on turn 122 with a horde of Nagas, but he only has Behemoths (1-4) and Orcs (50-99) left. My main force consisted of 50+ upgraded Unicorns, but I decided not to rush things and instead took another route with 8 Titans on turn 126, passing through a horde of unupgraded unique creatures. I took the Rampart in the center, and in the following turns, I killed a group of Knights for the Cloak of +2 Speed, then a horde of Ifrits for the Sword of +5 to All Stats, a horde of Giants with an upgraded stack for the Wings of Power, and a horde of Skorpios for the Orb of Redness. I also grabbed a Chalice of +6 to All Stats and a chest with 5 green artifacts. I took a couple of Drowned for upgrading and buying out the rest of the Titans, and I used the Loshaks to grab the Golden Bow. Crag was running around with Control, and I had Teleportation, so in the end, 20 Titans, the Golden Bow, the Orb of Redness, and +3 Speed did the trick. With one volley, I wiped out my opponent's stack (first the Angels, then the Vivs). Our combat stats were roughly the same, Crag ran away, and on turn 144, I received a message that he had surrendered.
Thanks for the game!