Monster Concept - Potential Boss

This is The Watcher or The Sentinel.

It is a cat-like creature with an eye on its tail and both shoulder blades. Its body is adorned with insect-like legs and pinchers on its chest. it has a slit on its chest acting as a mouth. The tail would most likely be the weak point. It is around 8 feet tall standing on all fours.

The Gem that is pressed into its face is used for a future venture which has not been mapped out yet.