Fulgore
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Yes, the mission is indeed quite challenging. D12(ArchOnt) provided a well-written guide on how to complete it. I would only add a few tips: you should attack the Undead Castle no later than the end of the second week; after the third reinforcement, it will be almost impossible to defeat the computer. Along the way, I only attacked Imps, Demons, and Skeletons guarding chests, and I focused on gaining experience rather than gold to develop my hero. I didn't attack the monsters guarding the magic power upgrades because there would inevitably be losses, and troops are scarce and more valuable than gold. Before the Undead Outpost, I killed the Skeletons guarding the mana well and the Plague Zombies guarding the artifact shop. I replenished my mana and bought as many artifacts as I could afford, mainly to enhance magic (to summon more Elementals). I cleared the Outpost and rushed to the Castle. On the way, I was attacked by an Undead hero with a main army, but I defeated him thanks to the Water Elementals. After the battle, I had almost no units left, but the computer also had very few units near the Castle. I killed the hero with 30 Bone Archers, and inside the Castle, there was a hero with only one Archer.
