Opsive

[Vahalla]

I wanted to know if this is compatible with opsive, as well as quest machine, mostly any other assets I have?

[Martin (Dragonsan)]

Atavism has its own controller, and you can, of course, integrate any of your choices, but it would require additional coding for sure. 

As for the quest machine. simple Integration wouldn't be possible because the Atavism server side is written in Java, so you would have to rewrite the quest machine for that, which is also possible, but I think you wouldn't want that. Atavism also has its own quests system built in.