Thingwalls will have a providence related task, wanting large quantities of certain item(s). There is no time limit to complete these, but once they are completed there is a 1week/2week cooldown before the next Thingwall task. The next task items will be visible during these 2 weeks so players can prepare.
Successfully completing a Thingwall task will reward all those who participated with EXP, LP, and the providence associated with the Thingwall will get some kind of boost, such as certain resources in the entire providence receiving a Quality boost, similar to that of a quest giver boosting Q, but this time far more wide-spread.
The idea is to help have more "MMO" in the game, and also to serve as an item sink.
(I didn't play this world so correct me if I'm wrong, but thingwalls are currently not quest givers, they're just realm borders, right?)