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I love the Dungeon. There's a hero there (I don't remember his name, but he's the one in my avatar), and he revives when I have an Earth Magic expert. I have a level 5 Magic Guild. The Mana Vortex is just an overpowered building; when I first saw this Castle and learned that it had this building, I was simply amazed. Trogolodites aren't very strong, but they are stronger than Cherubs, Goblins, Imps, Faeries, and possibly Skeletons. Harpies are just excellent and annoying for the enemy (especially if they have a blessing, but a curse has a very negative effect). Sorcerers and Medusas (see my message about archers). Minotaurs are powerful on their own. But I would like them to have more hit points. What I do like is their morale. Manticores are dangerous creatures, but they don't have many hit points. But it's nice when they paralyze someone. Black Dragons are just awesome. Having immunity to magic has very big advantages, but also disadvantages. At least curses and attacking spells won't affect them. The breath attack is also a great thing. You can immediately unleash fire on two enemies. But you have to be careful not to hit your own units. And I forgot to mention the Portal – I'm not saying it's just a great building, but if you've captured a Dragon Cave somewhere, an extra dragon won't hurt. It's just a shame that you can't customize this building.