Bright Eagle King

Keen Sight. The owlbear has advantage on Wisdom (Perception) checks that rely on sight.

Angelic Attacks. The Eagle King's beak and claw attacks are magical. When the Eagle King hits with any weapon, the weapon deals an extra 2d6 radiant damage (included in the attacks).

Innate Spellcasting. The Eagle King's spellcasting ability is Wisdom (spell save DC 15, spell attack +7). The Eagle King can innately cast the following spells, requiring no material components:

At will: Detect Evil and Dood, Blindness/Deafness. 
3/Day each: Pass Without Trace, Dispel Magic, Counterspell
1/Day each: Nondetection, Steel Wind Strike, Sickening Radiance, Dispel Evil and Good

Multiattack. The Eagle King makes two attacks: one with its beak and one with its claws.

Beak. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 10 (1d10 + 5) piercing damage plus 7 (2d6) radiant damage.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage plus 7 (2d6) radiant damage.

Angelic Blast (recharge 5-6). The Eagle King erupts in bright holy light. Every Creature within a 30 ft. radius to the Eagle King must succeed on a DC 15 Constitution saving throw or take 14 (4d8) radiant damage and is blinded for the next minute. A blinded creature can repeat the saving throw at the end of each of its turns. If a creature succeeds on the saving throw only takes halve the radiant damage. 

The Eagle King can take one legendary action to cast a spell or use its Angelic Blast. The legendary action can only be used at the end of another creature's turn. The Eagle King's regains spent legendary actions at the start of its turn.