only information i have, is in the chamber of elements, but will they dropped there by mobs, or can i get it by a npc ? 
How do i get Arcadia-Coins ?
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All bosses in custom content drop them. In ROFL you also get them in chests after Boss 2. Best farming options for them are either Tikal or DL bcz they are done the fastest I think. With a good party, maybe Hoto is even faster, but requires more to the players ofc. Altogether they're obtained in HoS, DL, Tikal, Inferno, Gorge, Rofl, Hoto and custom world bosses. Hope I didn't miss something
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Ah ok, thanks !
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New pantheon normal mode also reports 200 coins from last boss.
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Ah ok, thanks !
any instance form level 98 onwards has them.
Not too many though, but the amount escalates from 150 (Rites) to 6450 (not totally sure there) in rofl. -
Open day 25 of advent calendar to get 2000 arcadia coins.