AC 17 (natural armor)
HP 178 (17d10 + 85; bloodied 89)
Speed 30 ft.
Proficiency +4; Maneuver DC 18
Damage Immunities poison, psychic; damage from nonmagical, non-adamantine weapons
Condition Immunities charmed , fatigue , frightened , paralyzed , petrified , poisoned
Senses darkvision 120 ft., passive Perception 11
Languages understands the languages of its creator but can’t speak
Immutable Form. The guardian is immune to any effect that would alter its form.
Magic Resistance. The guardian has advantage on saving throws against spells and magical effects.
Constructed Nature. Guardians don’t require air, sustenance, or sleep.
ACTIONS
Multiattack. The guardian attacks twice with its slam.
Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.
Rock. Ranged Weapon Attack: +10 to hit, range 60/240 ft., one target. Hit: 30 (7d6 + 6) bludgeoning damage. The target makes a DC 18 Strength saving throw , falling prone on a failure.
BONUS ACTIONS
Slow (Recharge 5–6). The guardian targets one or more creatures within 30 feet. Each target makes a DC 17 Wisdom saving throw . On a failure, the target is slowed for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Combat
The stone guardian’s strategy is determined by its programming. Most commonly, it attacks the closest enemy first. It moves to include at least two creatures within range before using Slow. It throws a rock or other object if it can’t reach an enemy on its turn.
Legends and Lore
With an Arcana or Religion check, characters can learn the following:
DC 10 Spellcasters can build guardians, constructs that follow orders mindlessly.
DC 15 All guardians are immune to damage from nonmagical weapons and are resistant to spells. Depending on the material it is made from, a guardian may ignore or even be healed by certain effects. For example, clay guardians are healed by acid; flesh guardians are healed by lightning; and iron guardians are healed by fire.
DC 20 A damaged guardian may go berserk and no longer function properly.
Stone guardians appear in many forms, from rough or highly-detailed humanoid shapes to beasts or fantastical creatures. Motionless while at rest, they appear to be ordinary statues until they take action.
Stone guardians warp time around them unpredictably. Near a stone guardian, a feast may sit upon plates for hundreds of years without decaying, or it may crumble to dust within minutes. A stone guardian’s creator may find their lifespan unnaturally extended or look old beyond their years.
1–2 Guarding an area, attacking trespassers on sight
3 Attacks if trespassers touch or damage certain doors or items
4 Berserk; pacing among broken artwork and furniture, attacking anything that moves
5 Patrolling; stops to fix, clean, repair, or reset items
6 Attacks only to defend itself; clears a path in response to certain actions, such as unlocking a door if you say a certain word, stepping off a concealed trap door if you ask it to move, giving you a key if you beat it at chess, etc.
1 Magic mouth that poses a riddle; the answer deactivates the guardian for 1 minute
2 Several silver necklaces or rings; the guardian ignores creatures that wear this jewelry
3 A bell or gong; ringing it summons the guardian
4 DC 15 Investigation check: a notebook in an ancient language, containing phrases the nearby guardian must obey, such as "attack on sight,” "deactivate." etc.
5 Big round footprints that appear to have walked the same path countless times
6 Distant lumbering footsteps
Guardians stand sentinel over treasure in laboratories, temples, or tombs, or do the bidding of their masters in cities and towns.
CR 5–10 clay , shield , or stone guardian ; 1 or 2 flesh guardians ; flesh guardian with bolt-thrower , gargoyle , or 3 zombies
Treasure 4 rare books (200 gp each), spell scrolls of bestow curse , fear , and remove curse
CR 11–16 iron guardian ; stone colossus ; clay or stone guardian with 1 or 2 basilisks , gelatinous cubes , ochre jellies , or walking statues
Treasure 5 alexandrite gemstones (500 gp each), portable hole , manual of guardians
CR 17–22 2 clay or stone guardians
Treasure 800 gp, 20 rare books (200 gp each), bead of force , spell scrolls of flesh to stone and forbiddance , 2 maul (black iron, inscribed with the name “Black Key”; the first time each day the maul touches a locked door, it casts knock with spell attack bonus +10)
Constructs are beings that were built or made. Some are mindless machines, while others have some form of intelligence. Guardians are constructs.