Phantom Ruby

The Phantom Ruby (ファントムルビー Fantomu Rubī?) is an object that appears in the Sonic the Hedgehog series. It is an interdimensional gemstone of incredible power which was fought over by several parties across multiple dimensions. It plays a central role in Sonic Mania and its follow-up game Sonic Forces.

Appearance
The Phantom Ruby is a magenta icosahedron ruby with black ripple patterns along its surface. It is also small enough to fit in the palm of a hand.

Powers and abilities
While different from the Chaos Emeralds, the Phantom Ruby is still remarkably powerful and has been theorized to be a source of unspeakable power. When channeling its power, the Phantom King became powerful enough to bypass the invulnerability granted by a super transformation. Similarly, the ruby itself can also restrain the Chaos Emeralds and cancel out a super transformation. Its power is so great that it could affect the Master Emerald's ability to keep Angel Island afloat, causing the island to fall back into the ocean. The Phantom Ruby's abilities are said to outclass even those of the Master Emerald. Because of its massive amount of power, it was implied that the Phantom Ruby's mere presence at the heart of the Eggman Empire was such that Eggman could afford to have a comparatively small amount of his own forces stationed at Metropolis, provided the gem was at full power. The Phantom Ruby was also capable of reviving at the very least robots, as evidenced by how it revived the fallen Hard Boiled Heavies. The Phantom Ruby was also apparently close to being indestructible, as it managed to withstand a direct blow to Infinite's sword, despite it being sharp enough to effortlessly cut down several Eggman robots.

The Phantom Ruby's exact powers are based on virtual reality manipulation. It takes control of people's visual and depth perception to feed false information to the brain creating a new reality for them, and creates virtual projections that have mass and form to interact with the world around them. This includes empowering and altering beings (like the Hard Boiled Heavies, Classic Metal Sonic and Infinite) or creating illusory places and entities that make it impossible to differentiate between reality and fantasy. Its powers can also warp the fabric of space-time, allowing it to create pocket dimensions such as Egg Reverie Zone and Null Space, as well as teleport entities from place to place. When used alongside the Chaos Emeralds' time-space powers, it transported Classic Sonic and itself to another dimension, and later sucked Dr. Eggman into a rift (the latter also causing the Titanic Monarch to collapse).

When touched, the Phantom Ruby, as a default, seems to generate an illusion of whatever the person who touched it most desires, although these only last as long as it is being physically touched by the person. For example, when Infinite accidentally touched the gem, he was struck by images of a destroyed world of chaos, based on his own violent desire for change.

When used, the Phantom Ruby creates a by-product known as the Ruby Mist, a mist-like substance that distorts space-time within it.

The Phantom Ruby is also capable of assimilating Phantom Ruby prototypes, and anything directly connected to them; after being defeated, Infinite and his Phantom Ruby prototype were in pulled by the Phantom Ruby, consuming the prototype and Infinite along with it.

In Idea Wiki media

 * The Phantom Ruby appears in the HBO Max miniseries Jackal Squad.
 * The Phantom Ruby makes an appearance in DC vs. Sega. Infinite and a prototype with him appear in Terra's ending, on which she becomes the Ruby's new master after defeating Infinite and Deathstroke, and later uses it to form her own team called "Terra Squad"; she is shown wearing the Ruby as a necklace, while Metallo and Egg Golem are put under hers and the Ruby's control.