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I really like the Dracolich, and it's also a good idea to get some Ghosts early in the game from the ruined city. They are easy to breed, and then you can overwhelm the enemy with their numbers. Although, I like all the new creatures in Haven when it comes to upgrading creatures; they turned out to be quite strong for their level (if you judge by the upgrades in the castle and which creatures evolve into which). Well, except for the Sylvan Centaurs, which didn't impress me much, but the Werewolves can sometimes fail to reach the enemy, and the Lycanthrope's chance to hit isn't that high. Overall, if I had to choose, I'd go with the Dracolich.