Not 3 characters per week, but as many times you want
#can you farm atheon and oryx for exotics?
vapid spire
knotty sinew
you can only farm a raid for the exotic when it is the weekly featured raid. this week it is vog so yes that exotic is farmable
kf is not the weekly featured raid, so it is not farmable
rich smelt
yes u can, but u need to be on rotation
What is rotation? for example, now is vog u can farm how many times u want, next week will be other raid, just see what raid beside roots of nightmares drops pinnacle
swift lagoon