Everything is on the Abbey from the get-go. You’ll know when you are supposed to do something because each of the Blood Gate challenges has a recommended level to do it at. Then each Word of Power opens up more of the map to search for the next set of magical knickknacks to unlock to open the next Blood gate.
All 4 of the rods you can find once you have the Open word, it’s just a matter of running around to what is accessible to you right then.