Multiattack

The greater rakshasa makes two claw attacks.

Claw

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) slashing damage, and the target is cursed if it is a creature. The magical curse takes effect whenever the target takes a short or long rest, filling the target's thoughts with horrible images and dreams. The cursed target gains no benefit from finishing a short or long rest. The curse lasts until it is lifted by a remove curse spell or similar magic.

Harrowing Visions (Recharge 5-6)

The greater rakshasa chooses a point it can see within 60 feet, conjuring a terrifying manifestation of its enemies' worst fears in a 30-foot-radius around the point. Each non-rakshasa in the area must make a DC 18 Wisdom saving throw. On a failed save, a creature takes 66 (12d10) psychic damage and becomes frightened for 1 minute. On a success, the target takes half the damage and isn't frightened. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.