Spellcasting. Manshoon is an 18th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 19, +11 to hit with spell attacks). He has the following wizard spells prepared:
Cantrips (at will): fire bolt, light, mage hand, prestidigitation, shocking grasp
1st level (4 slots): detect magic, mage armor, magic missile, shield
2nd level (3 slots): detect thoughts, mirror image, misty step
3rd level (3 slots): counterspell, lightning bolt, sending
4th level (3 slots): fire shield, greater invisibility, polymorph
5th level (3 slots): Bigby's hand, scrying, wall of force
Metal Fist. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:4 (1d4 + 2) bludgeoning damage.
Manshoon uses the simulacrum spell to create a magical duplicate of himself as needed. He has customized the spell to increase his simulacrum's hit points at the expense of its spellcasting ability.