Minotaur Guards form the heavy troops of the minotaurs' army. They are tough short-range fighters but vulnerable by distance fighting weapons. Watch out for archers that are usually placed in the second row behind them.
Damage Taken From Elements
Ancient Temple, Mintwallin, Minotaur Pyramid, Maze of Lost Souls, Folda, Cyclopolis, Deeper Fibula Dungeon (level 50+ to open the door), Hero Cave, underground of Elvenbane, Plains of Havoc, Kazordoon Minotaur Cave, Foreigner Quarter.
Knights: should have good skills (over 55/55) and decent equipment to kill one of these. Minotaur Guards may be accompanied with Minotaur Archers and Minotaur Mages.
Paladins: can just attack them and try to avoid melee hits. It's really easy to outrun them while shooting Arrows, Bolts and Spears.
Mages: can use Invisible and then attack them with Runes or just running and shooting. Using a Rod or Wand is also as effective and saves runes. If your Level is a little higher, you can also combine a wand or rod with Ice Strike. You should have fairly good equipment.