So much variety that you check mobs by entering their color.
Blue, green … red… brown… orange…
I’m sorry but when you have a game with more than 100 maps, and more than 3-4 different monsters per map, you can’t have a different skin for every monster in the game, or you need the same budget than a Blizzard game.
But still, there is a very good variety in my eyes, in comparaison with a lot of games where it was the same re-use with different colours, but with 30 different skins instead of 150-200.
Some skins are used multiple times for sure, but I have seen much much worse…