Crystal Champion

Illumination.  The Champion magically sheds bright light in a 30-foot radius and dim light for an additional 30 feet. This light goes out when the Championfan is destroyed.

Bright Star.  Any creature that starts its turn within 10 feet of the illuminated golem and can see the golem must succeed on a DC 17 Wisdom saving throw or be blinded until the start of the creature's next turn. A creature can avert its eyes to avoid the saving throw at the start of its turn. If the creature does so, it can't see the Champion until the start of its next turn, when it can avert its eyes again. If the creature looks at the Champion in the meantime, it must immediately make the save.

Immutable Form. The Champion is immune to any spell or effect that would alter its form.

Magic Resistance. The Champion has advantage on saving throws against spells and other magical effects.

Magic Weapons. The Champions weapon attacks are magical.

Multiattack. The Champion makes a Phase Gnaw attack and fires two shards.

Phase Gnaw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 20 (3d8 + 7) piercing damage.

Shard. The Champion two of the following magical crystal shards at random (reroll duplicates), choosing one to three targets it can see within 120 ft. of it:

1. Paralysing Shard. The targeted creature must succeed on a DC 18 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
2. Weakening Shard. The targeted creature must succeed on a DC 18 Dexterity saving throw. On a failed save, the target's speed is halved for 1 minute. In addition, the creature can't take reactions, and it can take either an action or a bonus action on its turn, not both. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
3. Transfixing Shard. The targeted creature must succeed on a DC 18 Wisdom saving throw or be frightened for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
4. Anguish Shard. The targeted creature must succeed on a DC 16 Dexterity saving throw or take 25 (3d10) necrotic damage. The target dies if the ray reduces it to 0 hit points.

Vorpal Strike. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 40 (6d8 + 7) slashing damage. The target dies if this attack reduces it to 0 hit points by getting their head chopped off.

Return to The Stars (Recharge 6). The Champion forces a creature to see The Fall.  The target must succeed on a DC 21 Wisdom saving throw or take 26 (4d12) necrotic damage and become frightened until the end of the nightwalker's next turn. While frightened in this way, the creature is also paralyzed. If a target's saving throw is successful, the target is immune to the nightwalker's Finger of Doom for the next 24 hours.

The Champion has three legendary actions that he can take at the end of another creature's turn.

Gravitational Pull (Costs 1 Action). Any creature within 120ft. of the Chamption that isnt behind cover must make a DC 17 strength saving throw or be pulled up to 60ft towards it in a straight line, or 15ft. on a sucess.

Vorpal Strike (Costs 1 Action). The Champion makes a Vorpal Strike attack.

Return to The Stars (Costs 3 Actions). The Champion recharges and uses Return to the Stars.