Multiattack. The giant makes two attacks, using Thunderous Mace or Thundercloud in any combination. It can replace one attack with a use of Spellcasting to cast Fog Cloud.

Thunderous Mace. m +12, reach 10 ft. Hit: 21 (3d8 + 8) Bludgeoning damage plus 7 (2d6) Thunder damage.

Thundercloud. r +12, range 240 ft. Hit: 18 (3d6 + 8) Thunder damage, and the target has the Incapacitated condition until the end of its next turn.