Multiattack. The giant makes one Stone Sword attack and one Grab attack.
Stone Sword. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 19 (2d12 + 6) bludgeoning damage, and if the target is Medium or smaller, they must succeed a DC 17 Strength saving throw or fall prone.
Grab. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (1d10 + 6) bludgeoning damage, and the target is restrained (escape DC 17). Attacks against a creature the giant has restrained deal an additional 11 (2d10) bludgeoning damage. The giant has one free fist to restrain a target.
Rock. Ranged Weapon Attack: +9 to hit, range 60/240 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be knocked prone. The giant can replace the rock with a creature they have restrained, and a creature thrown in this way takes half of the damage dealt to the target.
Spellcasting. The stonecaller casts one of the following spells using Wisdom as the spellcasting ability (spell save DC 12, to hit with spell attacks +4):
At Will: Stoneskin, Light, Stone Shape
2/Day Each: Gust of Wind, Sleet Storm, Magic Weapon
1/Day Each: Blink, Major Image, Bestow Curse, Lightning Bolt
The stonecaller can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The stonecaller regains spent legendary actions at the start of their turn.
Stone Sword. The stonecaller makes one Stone Sword attack.
Storm of Boulders (Costs 2 Actions). The stonecaller tosses several pebbles into the air and magically enlarges them into boulders. All creatures in a circle with a 30-foot radius centered on a point within 60 feet of the giant must make a DC 17 Dexterity saving throw, taking 13 (2d12) bludgeoning damage on a failure, or half as much damage on a success.
Spellcasting. The stonecaller casts one spell with a casting time of one action.
Lair and Lair Actions
Stone giants know the mountains better than any humanoid race, making their homes in enormous caves spanning the sides of high peaks and the slippery junctions between outcroppings. They are adept at creating traps and pitfalls suitable for their territory and defend their lairs viciously. Indeed, any unfortunate creature to stumble into a stone giant's lair is likely to not even notice that they are in danger until a rock has silenced them for good.
An adult stone giant can trigger one of these lair actions (initiative count 20) unless the stone giant is surprised. No lair action can be taken two turns in a row.
Avalanche. The stone giant tugs a root or flicks a rock, causing part of the mountain centered on a point within 120 feet to collapse. All creatures within 30 feet of the point must succeed a DC 20 Dexterity saving throw or take 16 (3d10) bludgeoning damage and be grappled by the rubble (escape DC 20).
Stampede. The stone giant hollers and calls a stampede of mountain goats, which rush forth from the giant in a 120-foot line that is 5 feet wide. All creatures in their path must make a DC 15 Strength saving throw or be knocked prone.
Reinforce. The stone giant causes up to two allied creatures to move up their movement speed without triggering opportunity attacks.
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