Progression tab locked, what are eternals? How do I unlock them?

Title "How do I purchase an Eternals set? You can purchase Eternals sets directly from the champion detail page (in the new Progression section) or from the Eternals tab in the Store." Progression tab is locked on all my champions There is no Eternals tab in the store

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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