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At random intervals you get put in a raid and teleported to a PvE dungeon. The only way to get out, is to fight your way out through scripted mobs and raid bosses. You can try to solo it, but don't get your hopes up. If you can't do it, your char is stuck in there forever.
Don't let people have any choise. Choise would ruin the fun for PvEers. You see, PvEers don't like it when some people opt to not PvE. It ruins the game for them.