Assassins are perfectly normal units, and no one is planning to replace them. By the way, what gender are they?
They're male! I think it would be better to swap the Fury and Lizard Riders so that it's like this:
1. Scout, Assassin
2. Minotaur, Minotaur Guard
3. Lizard Rider, Lizard Raider
4. Beast, Fury
and so on.
Otherwise, it doesn't quite work out, since they have a matriarchal hierarchy...:(
