Glory. Hastain's Armor Class includes its Charisma modifier.
Hold Breath. Hastain can hold its breath for 1 hour.
Special Equipment. Hastain wears a talarith.
Spellcasting (Psionics). Hastain 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. Hastain 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 Hastain 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 Hastain from the following list: cold, fire, lightning, or radiant.
Summon Duplicate (Recharges after a Short or Long Rest). Using its talarith, Hastain 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.