The Chained Reaper

If a creature that can speak Orc within 30 feet of the reaper takes an action to read aloud the names carved in the stone on the reaper's back, the reaper takes 20 Radiant damage.

The reaper can see 60 feet into the Ethereal Plane when it is on the Material Plane.

The reaper can move through other creatures and objects as if they were Difficult Terrain. It takes 5 (1d10) Force damage if it ends its turn inside an object.

If the reaper fails a saving throw, it can choose to succeed instead.

The reaper makes one Balefire Scythe attack and one Chain attack, and it uses either Chain Slam or Fling.

Melee Attack Roll: +9, reach 15 ft. Hit: 14 (2d8 + 5) Necrotic damage, and the target begins burning. It takes Necrotic damage instead of Fire damage while burning in this way.

Melee Attack Roll: +9, reach 20 ft. Hit: 16 (2d10 + 5) Piercing damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 15) from one of four chains.

Constitution Saving Throw: DC 17, each creature Grappled by the reaper. Failure: 9 (1d8 + 5) Bludgeoning damage, and the target has the Stunned condition until the start of the reaper's next turn. Success: Half damage only.

The reaper throws a Large or smaller creature Grappled by it to a space it can see within 30 feet of itself that isn't in the air. Dexterity Saving Throw: DC 17, the creature thrown and each creature in the destination space. Failure: 9 (2d8) Bludgeoning damage, and the target has the Prone condition. Success: Half damage only.

The reaper makes one Balefire Scythe attack. The reaper can't take this action again until the start of its next turn.

The reaper moves up to half its Speed without provoking Opportunity Attacks.

Wisdom Saving Throw: DC 17, each creature of the reaper's choice in a 20-foot Emanation originating from it. Failure: The target has Disadvantage on ability checks and attack rolls until the end of its next turn.