Glory. The reigar's Armor Class includes its Charisma modifier.
Hold Breath. The reigar can hold its breath for 1 hour.
Special Equipment. The reigar wears a talarith.
Spellcasting (Psionics). The reigar casts one of the following spells, requiring no spell components and using Charisma as the spellcasting ability (spell save DC 18):
At will: light, mage hand, prestidigitation
1/day each: mass suggestion, sending
2/day each: dimension door, phantasmal force
Multiattack. The reigar makes two Trident attacks.
Trident. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 20/60 ft., one target. Hit:7 (1d6 + 4) piercing damage, or 8 (1d8 + 4) piercing damage if used with two hands to make a melee attack, plus 3 (1d6) force damage if the reigar is wearing its talarith.
Chromatic Bolt. Ranged Spell Attack: +10 to hit, range 90 ft., one target. Hit:22 (5d8) damage of a type chosen by the reigar from the following list: cold, fire, lightning, or radiant.
Summon Duplicate (Recharges after a Short or Long Rest). Using its talarith, the reigar summons a duplicate of itself. The duplicate obeys the reigar's commands and uses the reigar's statistics, except it is an unaligned Construct that doesn't have a talarith of its own. The duplicate takes its turn immediately after the reigar. It vanishes after 1 hour or when it is reduced to 0 hit points.
Reigar were once cephalopods similar to octopi. They inhabited the stormy seas of Ysgard until the gods of that plane transformed them. They have bioluminescent freckles and the ability to change the coloration of their skin. A glory (or halo) surrounds each of them. This magical display is a cloud of twinkling, glittering motes that changes color randomly and repels attacks.