The Missing Key

Find a Grotto Key on the 3rd or 4th floor of the Frozen Grotto and hand it to the Frozen Grotto Guardian to open the way to the 5th floor.

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29 Oct 2026

What it is

The Frozen Grotto is an old, dangerous dungeon where many heroes have died hunting for its treasure. Six of its floors have been dug out so far. To climb past the 4th floor you need a key, and this short quest is how you get it. It is open on all servers and has no requirements.

Steps

Explore the 3rd and 4th floors of the Frozen Grotto until you find a Grotto Key.
Go to the Frozen Grotto Guardian on floor 4 (387,460) and give him the key.
He sends you up to the 5th floor.

Sources

Official guide: The Missing Key

Game pictures: © TQ Digital / NetDragon · co.99.com

World

Frozen Grotto

An icy cave of six floors for levels 120–129, entered from Desert City, with serpents and blade devils on the upper floors and the Terato Dragon at the bottom.

Quests

Fiend's Lair

An 18-floor dungeon in Twin City. Floors 1 to 10 cost silver and pay silver; floors 11 to 18 need a CPs permit and their bosses can drop huge CP prizes.