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Well, to be honest, I haven't played in any online or offline tournaments yet! But I don't really like playing as Necropolis; only the Death Knights, Liches, and Vampires are decent, and the Lords regenerate. That's it; there's not much else to brag about. Even though Skeleton Warriors are among the top units in the early levels, they aren't that great, and we won't even talk about Zombies – they're weak in terms of movement and attack, even when there are many of them! And what about Specters? They drain a little mana and regenerate health every round, but that's it! As for Wraiths, they're terrible. They rarely inflict aging, and when they do, it only affects 1 out of 5 or 6 attacks! And they have very little health! Their skills are... well, let's just say they're not very good (crappy skills – there's no other way to put it!). The only good thing is that they're cheap. And among the 7th-level units, Bone Dragons and Specters are in 8th and 9th place, only competing with Phoenixes! They're as weak as cheap clothes from China. Overall, this Castle is weak.
Added 1 minute ago
The 7th-level unit from Necropolis is terrible! Above, instead of "Wraith," it should be "7th-level unit," and it's in the fourth line at the end.