Tomb Guardian

The Tomb Guardians are humanoid creatures made entirely out of sandstone. The Tomb Guardians are found near tombs located on Mars, hence their name.

Biology
Tomb Guardians are humanoid creatures who appear to have their entire body covered in sandstone rocks. Their main form of self-defense is to throw large boulders at whatever is threatening them. The Tomb Guardians appear to have no need for food or water. The Tomb Guardians reproduce by splitting into multiple Tomb Guardians, which then take time to grow afterwards and repeat the process.

In the Origin System, Tomb Guardians have only been seen on Mars, standing guard over the Tomb of Inaros, a legendary Tenno who defended the People of Mars from the Orokin and the Infestation. However, the Atlas Warframe is able to summon similar stone constructs known as Rumblers using its own void energies to assemble and animate them. This may be how the Tomb Guardians were made, although Inaros has never demonstrated any such ability to create them himself.