Innate Spellcasting. The flesh golem's innate spellcasting ability is Wisdom (spell save DC 12, +4 to hit with spell attacks). It can innately cast the following spells, requiring no spell slots:
Heated Body. A creature that touches the flesh golem or hits it with a melee attack while within 5 feet of it takes 4 (1d6) fire damage.
Slam. Melee Weapon Attack: +5 to hit, reach 5 ft, one target. Hit: 7 (1d6 + 3) bludgeoning damage plus 4 (1d6) fire damage. Fire Bolt. Ranged Spell Attack: +4 to hit, range 60/120, one target. Hit: 8 (1d10+2) fire damage.