Breath Fire. When Bowser gets angry, he breaths fire and all creatures in a 10 foot radius must make a DC 15 dexterity saving throw. on a fail, the target takes 2D6 fire damage.
Multi-attack. Bowser makes three mace attacks
Bite. Melee Weapon Attack: +3 to hit, reach 10 ft., 1 target. Hit: 5 (1D6+2) [piercing] damage.
Claw. Melee Weapon Attack: +4 to hit, reach 10 ft., 2 targets. Hit: 7 (1D6+5) [slashing] damage.
Spikes. Ranged Weapon Attack: +3 to hit, range 40/100 ft., up to 5 targets. Hit: 7 (1D6+4) [piercing] damage per spike. shoots 5 spikes.
Mace. Melee Weapon Attack: +5 to hit, reach 50 ft., 1 target. Hit: 14 (2d8 + 6) [Bludgeoning ] damage.
Fireball. Ranged Weapon Attack: +8 to hit, range 100/300 ft., 1 target. Hit: 15 (2d12 + 3) [Fire] damage.
Wheel of Fire (2/ day). Creates a magic wheel made of 10 fireballs and magically throws it. have the target make a Dexterity saving throw. on a fail, the target takes 2D12+3 fire damage for each fireball.
Wheel of Maces (1/ day). Creates a magic ring of 6 maces that he hurls at the target. target must make a dexterity saving throw. on a fail, the target takes 2D8+6 bludgeoning damage for each mace.