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A couple questions about Sudden Tempest:
1) Does the ring chosen by Sudden Tempest receive a fate during the fate phase?
2) Can the ring chosen by Sudden Tempest be picked via effects like Master of Gisei Toshi and Secluded Shrine that don't specify an "unclaimed ring"?

The removed ring will not receive fate during the fate phase while it is removed from the unclaimed ring pool, but it can be chosen by effects that refer to any ring (regardless of zone) such as Master of Gisei Toshi or Secluded Shrine.

[Tyler Parrott, Sep 13 2020]

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Two more quick questions about Sudden Tempest.

(1) If I play this, is a Greater Understanding attached to the ring discarded?
(2) Can I put fate on the fire ring using Master Alchemist if it was removed from the ring pool?

(1) The attachment is not discarded—the ring is not out of play, it is just removed from the unclaimed ring pool (which removes it from most cards’ abilities to interact with it)
(2) You can spend fate to the Fire ring with Master Alchemist if the ring has been removed from the unclaimed ring pool.

[Tyler Parrott, Sep 21 2020]