Multiattack

The ghast makes one Bite attack and two Claws attacks. If one Bite attack and at least one Claws attack hit a creature that isn't a Construct or Undead, the target must succeed on a DC 13 CON save or contract ghoul hunger (see the Ghoul Hunger sidebar).

Bite

_Melee Weapon Attack:_ +5 to hit, reach 5 ft., one target. _Hit:_ 7 (1d8+3) piercing damage.

Claws

_Melee Weapon Attack:_ +5 to hit, reach 5 ft., one target. _Hit:_ 8 (2d4+3) slashing damage. If the target is a creature that isn't a Construct or Undead, it must succeed on a DC 13 CON save or be paralyzed for 1 minute. The target can repeat the save at the end of each of its turns, ending the effect on itself on a success.