Legends Run This Month

Can someone please confirm the legends title requirements for this month’s event quest? The in-game mail states Heroic/Master difficulty (attached photo) but there was a bit of an expectation it would be Uncollected/Cavalier difficulty this month (is that the mythic title?).
Would appreciate clarity and a reference to it. If it’s heroic/master that’s great, but it didn’t say in the quest announcement either.
Would appreciate clarity and a reference to it. If it’s heroic/master that’s great, but it didn’t say in the quest announcement either.

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