Cliff Giant

Natural camouflage. Given 4 hours of preparation, a cliff giant can blend in to the natural terrain of a larger cliff, hill, mountain or cavern, becoming hidden. Otherwise, the cliff giant has advantage on stealth checks when hiding against cliffs, caverns, hills, or mountains.

One with nature. The cliff giant can sense the presence and movement of any creature on its body using its Tremorsense.

Multiattack. The giant makes two greatclub attacks.

Greatclub. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 18 (3d8 + 5) bludgeoning damage.

Rock. Ranged Weapon Attack: +8 to hit, range 60/240 ft., one target. Hit: 21 (3d10 + 5) bludgeoning damage.

Landslide. The cliff giant swings with their Greatclub (reach 10 ft) at terrain either above or below a creature. If there is no terrain above or below the creature (i.e flat ground) the cliff giant cannot use this action. The above swing causes difficult terrain on the resulting landslide zone, and the below swing causes the cliff face it targeted to  collapse, becoming a steep slide to the bottom that creatures cannot walk across.

Landslide (above): The swing causes a 15-foot square landslide. Each creature in the landslide zone must succeed on a DC 15 Dexterity saving throw or take 25 (4d10 + 3) bludgeoning damage, moving to an adjacent tile and taking no damage on a success, or half damage if no adjacent tiles are available.

Landslide (below): The swing causes the land underneath each creature in a 15 by 5 foot rectangle to collapse. Each creature on the collapsing cliff zone must succeed on a DC 15 Dexterity saving throw or take 12(2d8 + 3) bludgeoning damage and fall down the cliff zone to the nearest tile below the cliff, taking any additional falling damage and landing prone. On a success, the creature moves to an adjacent tile, or grabs on to rocks and roots while dangling on the cliff face if no adjacent tiles are available.