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For those unfamiliar, Tarnished Undermine Reals were a Season of Discovery currency acquired in various dungeons and used to purchase items, including gear, toys, patterns, reagents, and more. If you didn't play SoD, these are somewhat similar to Badges of Justice from The Burning Crusade Classic Anniversary. You can check out Tarnished Undermine Real's Season of Discovery guide for a better idea of how these worked there.
Tarnished Undermine Real Guide
That said, it's unclear how players will acquire them, but based on Season of Discovery, it could be end-game, pre-raid dungeons.
