Crystal of Atlan published “Boss Showcase: Battle Against The Machine Lifeform! NieR: Automata Collaboration” on May 21, 2026. The video is a collaboration video.
Dungeon "Battle of Grün" Opens May 21! The NieR: Automata collaboration dungeon "Battle of Grün" officially opens on May 21! Facing the massive enemy "Grün"—a Goliath-class Machine Lifeform! Will you flee? Or will you face the battle?
In the patch notes
The same drop appears in the publisher's May 14 Version Update Notice (May 14, 2026):
The NieR collaboration event continues to heat up! We may have already announced some collaboration content before, but we still have plenty more surprises in store! On May 21, we'll be announcing new outfits, pets, mounts, brand new collaboration events, casual mini-games—all designed to let you experience the wonderful charm of [what if Crystal of Atlan and NieR's worlds combined?]. Collab-exclusive items and weapons will also be available! Use them to make the most of your time in Atlan!
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