Introduce a variant of a Savage mount that everyone gets if you cleared the last floor in a Savage tier in week 1, make it the same model, like megaloambystoma, but with some minor particle effects (not too much). I think this is a good way to add some prestigious mounts.

I can already hear the complaints "noooo this is elitist" actually that is the point, thank you for agreeing, it is for the elite, it's an elite mount. If I see a shiny megaloambystoma, I will know that person cleared Savage week 1.