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This was what I finally decided upon by the way:
Quests
There will be
storyline quests and
secondary quests.
I'm just naming storyline quests
Story to get rid of any ambiguity there.
Story quests have to be completed in some kind of order (allowing for branches and loops, of course).
Normal quests can be completed at any time in any way (but may comprise of arcs of a couple or more quests). An "epic quest" is one that is not long enough to be a storyline campaign but is longer than your average couple of quests.
Campaigns
Ok, not sure about my wording, but I've always used Campaign so.
A campaign will be a series of quests released in one big update. Consider it a game within a game, with a fully fleshed out storyline. The first will be
Inquisition.
They will add new areas, new characters, and new things to do.
Sometimes during a campaign you will come across a
Battle.
Battles
You can enter battles at any time! But they actually fit into campaigns as quests. You must complete the battle to complete the campaign, but anyone at any time can enter the battle, if that makes sense.
Battles involve several people, think of it like a raid or whatever. I'm not sure what the mechanics will be but basically several people will strive towards a goal at the end. It will be able to be solo'd but the emphasis will be on completing it as a team.