Obelisk

The "Obelisk" is a corrupted Gem which powered the temple.

Appearance
It is a large, upright, rectangular prism with pyramids floating off of both ends. The top pyramid appears to have four faces on its sides. Three of the faces are frowning and the fourth one appears to be smiling. The bottom pyramid is in two pieces and has a triangle pattern on it. The obelisk's body has an abstract pattern on it that resembles a humanoid. The hands are designed to look like they are holding a gemstone that is embedded in the "chest" of the obelisk. The gemstone is a table cut with a white color and reflective surface.

"Serious Steven"
The obelisk was found by the Crystal Gems in a room filled with small spinning pyramids. They discovered that the gemstone in the obelisk was powering the mechanism in the temple that trapped them in never-ending rooms. Steven was thrown by Garnet to the obelisk to remove the gemstone. However, he couldn't move the gem until the obelisk's smiling face turned towards him. The gem then glowed yellow and was removed from the obelisk, throwing Steven to the floor. The obelisk was not affected by the gem's yellow glow, but it is not seen after the Pyramid Temple explodes.

Trivia

 * The name "obelisk" was given in its model sheet.
 * With its anthropomorphic design, the obelisk can be compared to a stele, which were funerary or commemorative monuments built by several ancient cultures.
 * The gemstone contained in the obelisk is the first known corrupted Gem to not take on a monstrous form.
 * The second being the Desert Glass.