[Endovior]

Another important distinction is that RoS is easier to make... important when bootstrapping Astral. The possibility of going Crystal Coin -> Starshine Skullcap -> Ring of Sorcery -> Ring of Wizardry opens up a lot of doors, and is available to many nations.

If you don't have a high-astral pretender, it's basically THE way to get at those high-astral spells; an S3 mage becomes S7 with all that gear on.