Boulderax is made up of two pieces, a head, and a body. The head is stone grey, and is textured like an uneven rock. The body is made up of 3 smaller pieces, but comes assembled in the box. Two of the pieces are arms, which like all minifigures, are able to hold objects. However, their wrists do not turn like the normal minifigure, and their hands are also much larger. The third piece is the main part of the body. It is mostly made up of transparent green plastic, but it also has chunks of stone grey in it, which makes it look like a mixture of large pieces of green crystal and rocks. The entire body piece has the same rocky texture as the head. The head is attached on a hinge, allowed the entire thing the flip upwards. When open, the inside of the body is hollow, allowing you to put a crystal inside of it, and close the mouth.
The Boulderaxes are strong, but slow and not very smart. Once they start attacking miners, they enjoy smashing things so much that they forget about the crystals. Since they're not very smart, Glaciators try to get them to do their dirty work for them. The Boulderaxes will sometimes attack the Power Miner's vehicles just for the fun of it. However, Boulderaxes are also one of the least common rock monsters.
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|Power Miners:||Brains | Duke | Doc | Rex|
|Rock Monsters:||Boulderax | Firox | Geolix | Glaciator | Meltrox | Sulfurix | Tremorox | Crystal King|
|Lava Monsters:||Combustix | Eruptorr | Firax | Infernox|