The East Crater

The East Crater is a location found in Wario Land 3. It isn't accessible from the beginning, however, when Wario gets the Crater Map from Tower of Revival, he can access this level.

The level takes place inside a volcano. To get to its bottom, Wario has to break several enemy blocks with barrels. Lumpies can also be found here. Wario can shake the ground to get them out of the way. In the bottom of this level, Wario can also find lava, that, if he falls in it, he'll turn into Flaming Wario. This will allow him to defeat the Lumpies. This is where Wario gets his very last power-up.

Gray chest: Golden Gloves
To get this treasure, Wario must first get to the level's bottom by breaking enemy blocks with barrels and avoiding Jellybobs. Then, he has keep shaking the ground to make the Lumpy get to the top. He can use him to get the gray key. Then, Wario has to use the lava and transform into Flaming Wario, and defeat the Lumpies to the left who are blocking the way to the treasure chest. Then, he simply has to open the chest to discover his last power-up that allows him to lift heavy enemies.