This journal would be carried by your character and, when opened, allow you to re-experience any mission from your personal story, with hard mode versions available. You receive experience and gold as a reward for completing them, rather than the original rewards.
In addition, new missions can be added further back in your timeline should Arenanet ever decide to expand on particular aspects of the story (such as giving you new missions with your mentor before Claw Island). The Soulbound Journal would allow you to go back to this moment and experience the new content as if it were a memory, keeping immersion intact.
The past can’t be rewritten, but it can be relived, forever bound to your character’s soul and memories.
Anet has shown they at least were not opposed to this idea. Missions were replayable in GW1. Some you went back to the outpost, others (in EotN) you went to the scrying pool to reactivate. I’d love a similar option in GW2.
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