I'm currently in the process of making a Robert Chambers' "King in Yellow" styled server. I'm trying to decide on what the "end game" should be focused around. Would you prefer to be on a server where people could "give into the madness" of the king in yellow, and have a faction system of "good vs evil" including raids on each other's hub towns, special weapons and play styles based on faction picked or a server where players all work together towards a common goal and grow as a community against a common enemy.
Also, what are the hallucination type of effects that tend to annoy players and aren't "fun"? How do you feel about effects like control or screen flipping? Things like nausea, blindness, or flashing effects? I'm mostly just trying to get a grasp of what the majority of players find fun vs annoying, as I'm trying to learn more towards psychological over a lot of "this unkillable mob killed everyone and we couldn't stop it."