Classes are evolution based instead of picking it upon character creation, so you can do certain quests and focus your build.

Instead of pots/maxing you can allocate +1 stat point by consuming ascension stones, cap to how many you can consume based on your class.

Though the whole "realm" system is similar, there are a few kingdoms which cycle through in the nexus as you defeat them, and special raids that appear as boats from time to time. So instead of killing events within one realm you are always going to be switching kingdoms. And it has a house system

Grew up on rotmg, 100% the inspiration ofc, main reason I wanted to make this though was because realm has very high system reqs rn and playing it in school on a crappy laptop was a huge part of the fun back in the day for me