Rarethereal Crossword

On May 20th, 2017 after all Rarethereals had been released, a puzzle crossword was posted by BBB.

Solving it required looking at Rarethereal Research previously posted for all 15 Rarethereals.

There is no known hidden purpose with the puzzle (such as teasing a new Monster or Feature), other than to wrap up the release of all Ethereals.