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If anyone can advise, please tell me how to play as Fortress. I play with friends in Heroes, and I can win with other factions, but I haven't won a single time with my favorite Fortress. Please advise on tactics, which heroes to use, and which buildings to construct.
Fortress has the advantage that you can reach level 6 in the first week (Wyverns). With Wyverns, you can clear a very large area around the castle.
Mighty Gorgons drain life if the last unit of the enemy has less than 50% health (I think). There's no point in leveling them up to 1, 2, 3, or 4; it's better to focus on higher levels. 20 Gorgons deal 1-2 damage + deadly gaze, resulting in 2-3 Dragons per attack.
To be continued...