No God Artifact aka God Weapons in RoX, because it was made into Gold Equipment already lol.
(Look at the Mystletainn).
If you own a castle, you can enter Abyss Corridor to mining Shadow EQ mine & farm MVP for Shadow EQ Cultivation.
Those items can be bought from Exchange, so it actually did not affect character growth too much, just an extra income for them? Because they can sell it.