According to multiple datamined spell and item entries, we’ll be returning to Scarlet Monastery for an unknown reason and a boss fight in Patch 10.1.7.

The Scarlet Key is an item added in the latest 10.1.7 PTR build.

The Scarlet Key is a new spell linked to the above item. The tooltip says: Retrace the steps of those who came before.

Scarlet Monastery of Old – Grants access to Scarlet Monastery of Old for all characters on your account.

The encounter database table has been updated with the following entry: Bloodmage Thalnos.

On top of that, the Tabard of the Scarlet Crusade icon has been changed to an encrypted File ID. Courtesy of keyboardturn.

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Blizzard probably won’t test this on the 10.1.7 PTR, so we’ll need to wait until the patch releases on live servers to find out what’s in store for Scarlet Monastery.