What is there to check? The clan is destroyed, everyone is dead, and those who didn't die ended up in slavery and were eaten by their minotaur colleagues when they forgot to pay them :D There's not much to check with such a legend.
Actually, I think Railag knew everything from the beginning, he just had his own goals. To reach the Overlord, help Tieru... So he kept the girl for himself, so she would be useful later ;)
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