Innate Spellcasting (Psionics). The githyanki's innate spellcasting ability is Intelligence (spell save DC 13, +5 to hit with spell attacks). It can innately cast the following spells, requiring no components:
At will: mage hand (the hand is invisible)
1/day each: plane shift, telekinesis
3/day each: jump, misty step, nondetection (self only), tongues
Multiattack. The githyanki makes two silver greatsword attacks.
Silver Greatsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit:13 (2d6 + 6) slashing damage plus 10 (3d6) psychic damage. This is a magic weapon attack. On a critical hit against a target in an astral body (as with the astral projection spell), the githyanki can cut the silvery cord that tethers the target to its material body, instead of dealing damage.
The warlike githyanki and the contemplative githzerai are a sundered people-two cultures that utterly despise one another. Before there were githyanki or githzerai, these creatures were a single race enslaved by the mind flayers. Although they attempted to overthrow their masters many times, their rebellions were repeatedly crushed until a great leader named Gith arose.