How does `soraka` interact with `temporary`? Do they go back to base when they die? Do they still have `temporary`?

Based on the rules and the provided FAQs, here is how Soraka, Wanderer interacts with units that have the Temporary keyword:

1. Does Soraka save units with Temporary?

Yes. According to RiftJudge FAQ #2131, Soraka’s ability acts as a replacement effect that intercedes when a unit would die. Because the Temporary keyword is functionally a "Kill" instruction at the start of the Beginning Phase (Rule 816.1.b), Soraka’s ability can replace that death event.

2. Do they go back to base?

Yes. When Soraka’s ability replaces the death of a unit with Temporary, it instructs you to "heal it, exhaust it, and recall it." Recalling a unit sends it to your base. Since your base is a board location, the unit remains on the board and is not sent to the trash.

3. Do they still have the Temporary keyword?

Yes. The unit retains the Temporary keyword. Because the unit was recalled to your base (which is a board zone) rather than being sent to the trash or a non-board zone, it does not lose its characteristics or keywords (Rule 110).

Important Nuance: The "One-Turn" Limit

While Soraka saves the unit, this only buys the unit one extra turn. Because the unit still has the Temporary keyword, it will trigger again at the start of your next Beginning Phase. If Soraka is still in play and the conditions are met (the unit still has less Might than Soraka), she can save it again, but the unit will continue to be threatened by its own Temporary ability every turn until it is no longer Temporary or Soraka is no longer able to save it.

This interpretation is based on Rule 816 (Temporary), Rule 453 (Recalls), and RiftJudge FAQs #2131 and #2.