Multiattack. The Keeper makes two battleaxe attacks.
Battleaxe +1. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit:20 (3d8 + 7) slashing damage, or 23 (3d10 + 7) slashing damage if used with both hands.
Rock. Ranged Weapon Attack: +9 to hit, range 60/240 ft., one target. Hit:28 (4d10 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be knocked prone.
Rock Catching. If a rock or similar object is hurled at the Keeper, the giant can, with a successful DC 10 Dexterity saving throw, catch the missile and take no bludgeoning damage from it.