Ruin Sentinel is an Enemy Group of Automatons in the Inazuma region. They are usually found in groups, all Ruin Sentinels will take the form of a robotic cube when dormant. When not dormant, they will be patrolling on a fixed route.
Ruin Sentinels are also present when fighting the Perpetual Mechanical Array, with the boss itself being comprised of each of the four types.
- Perpetual Mechanical Array - an enemy that can split into four different Ruin Sentinels, in addition to assembling as one large machine.
- The Ruin Scout resembles the Psy Meduzoa from Honkai Impact 3rd.
- Their designs are based on biological aspects of nature, with each representing a different type of organism. This is untrue for the Ruin Guard, Ruin Hunter and the Ruin Grader.
- According to Muzhen during the Thunder Sojourn event, similar machines have once been dug up at The Chasm.