Quests
complete quests to gain experience, items, reputation, and achievements. (probably more)
quests will be organized by zone and will relate to at least 1 skill
if quests require the player to travel to more than 1 zone, they will be broken up and referenced to in parts.
quests will require player interaction to accept/complete (phases).
there will be fetch, delivery, kill, and trial(basically an idle escort/defense quest) - trials will ideally be fully afkable but if it's for a special questline or there is an overwhelming thematic purpose I could imagine requiring interaction between the accept and complete phases of quests.
the only story relevant quest will be the tutorial quest. most quests will have some requirement needed to accept but the goal would be to allow players to be able to complete quests in any order they choose, especially if it's not optimal.