That would be a solid CR 7 or 8 creature except for its advanced sensory abilities (namely the largest radius blindsight i have ever seen and continuous true seeing, an ability only greater demons have) and its low hit points (but incorporeality helps too). Have you considered making this creature a deathless instead of an undead?
You are missing the difficulty class for your spell like abilities (10 + spell level + wisdom modifier in your case)
Also cone of paralysis dc is way off. Its 17 rather than 21. All supernatural abilities are based either on charisma or on constitution.
You forgot to list the fortitude save of the creature