magnum
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I captured 2 castles with dragons. I only bought the dragons. Level 10 grants a spell to summon creatures from the castle. You need to survive until then. Then, you run to your castle, which is fully fortified. Place artifacts on your troops (magic protection +60%? I don't remember, sorry). You need to withstand 2 attacks. It's important to keep 60-70% of your titans alive. This is quite achievable. Buy heroes in the tavern. Use them as bait and as a caravan.