aura Nodes Get Harder and harder to find in the world nether and farm world the Onves i find a Claimed exept the Silver wood Nodes my suggesten is Buyable Nodes On the Servers Whit thuamcraft
Look in the Deep dark. Thats where i tend to find the most. You can always go to the farm world as well.
worst case you can survive in thaumcraft with no nodes at all by collected the aspect orbs dropped by mobs. But thats just some agrarian skies bleeding through there.
