Рон54
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Well, to remove a creature from a megapack, you need to understand how mods work; I learned this by tinkering with other people's mods.
But your question is easily solved – you just need to Google "Balrog" and find a topic on HeroesCommunity.
http://heroescommunity.com/filespace/file/NCF%20Balrog.rar
This is a link to the mod, not to the topic, because either the author or some moderator-joker crossed out the correct link to the download and put the link to a VPN below... well, they didn't delete it, thankfully.