Lone Corsair
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I'm not talking about a Castle from Heroes of Might and Magic III, but one from World of Warcraft, a flying castle similar to the Academy, but darker. Regarding the Flesh Golems, can you suggest who would fit the role? As for the Ice Serpents, that's not quite what I was talking about. Yes, Ice Dragons are skeletal dragons with pieces of ice. Ice Serpents are more like spectral serpents; I imagined a transparent, ice-like dragon. If we can give them an ability like spell reflection, they will differ not only in appearance from the Ice Dragon but also in abilities.
Flying castles are a staple of undead structures and were present in Heroes of Might and Magic III. The idea is 50% nonsense, 50% passable. It's still too early to think about Necromancers.
What about coal dragons as an alternate upgrade for skeletal dragons, since we're talking about World of Warcraft?
NOOOOOO!!!!!!