Actions

Multiattack.

The githyanki makes three Longsword or Telekinetic Bolt attacks, or it makes one of those attacks and uses Spellcasting.

Longsword.

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage, or 8 (1d10 + 3) slashing damage if used with two hands, plus 22 (5d8) psychic damage.

Telekinetic Bolt.

Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 28 (8d6) force damage.

Spellcasting (Psionics).

The githyanki casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 15):

At will: light, mage hand (the hand is invisible), message
3/day each: fireball, invisibility, nondetection (self only)
1/day each: dimension door, plane shift, telekinesis

Bonus Actions

Astral Step (Recharge 4–6).

The githyanki teleports, along with any equipment it is wearing or carrying, up to 30 feet to an unoccupied space it can see.

Environment: Desert, Mountain, Urban

Githyanki Gish