Sentinel (Sonic Boom)

"The time has come to finish what we started one thousand years ago. Now, go forth, and destroy every plant, every animal -- everything that lives and breathes. Then, together, we will build a glorious world of metal. Rise my warriors!"

- Lyric the Last Ancient, Sonic Boom: Rise of Lyric

The Sentinel is a character that appears in Sonic Boom: Rise of Lyric. They are a mass-produced line of robot warriors of titanic proportions, created by Lyric the Last Ancient. The Sentinels were Lyric's ultimate weapon in his endgame against all organic life on the planet, being the very force meant to wipe it all out. During his two attempts to dispatch them however, they were stopping by Sonic the Hedgehog.

Appearance
The Sentinels are truly colossal robots of epic proportions, each being as a tall as a skyscraper, if not more. They are humanoid in shape, are composed of reddish-brown metal and have red eyes. They possess a round torso with a round intake chamber in the middle that glows yellow and three-fingered arms which are longer than their legs. Their heads possess no visible neck, with helmet-like features, and they have a pair of horns that form a circle, although the one on their right is longer than the one on the left.

History
The Sentinels were created one thousand years prior to the events of Sonic Boom: Rise of Lyric by Lyric the Last Ancient. Having developed a blind hatred for everything organic, the Sentinels were meant to help Lyric realize his ambition of creating a world of only metal and robotics by destroying everything organic on the planet and then help him rebuilt the world in his image. From within Lyric's Weapon Facility, the Sentinels were mass-produced and Lyric eventually amassed an entire army of them which he assembled at his lair. The only thing needed to complete the Sentinels were the Ancients' Chaos Crystals, but before Lyric could find them, Sonic the Hedgehog and Tails, who had arrived from the future, helped a rogue MAIA unit take control of a partially built Sentinel which she used to stop Lyric and help imprison him. As such, the Sentinels were abandoned, with some of them ending up buried at Cliff's Excavation Site.

A thousand years later, Lyric was freed and resumed his plans by collecting the Chaos Crystals and use them to reboot his Sentinel army. After taking the Crystals from Team Sonic, Lyric brought them to his lair where he placed them into receptors for the Sentinels and finally brought his army online. Before the Sentinels could be unleashed on the world however, Lyric was defeated by Team Sonic who reclaimed the Chaos Crystals. The Sentinels were then shut down permanently after Sonic got rid of the device that let Lyric control them.

Powers and Abilities
Little is known about the Sentinels' capabilities. However, their enormous size gives them immeasurable physical strength. While their true potential is unknown, they are implied to be an unstoppable force of mass destruction. A lone and only partially complete Sentinel was powerful enough to lay waste to Lyric's Weapon Facility and stop Lyric's carefully laid out plans in their tracks and an entire army of them is said to be able to destroy all organic life on the planet.