Like normal objects, the guardian dogu has Hardness. This Hardness reduces any damage it takes by an amount equal to the Hardness. Once the guardian is reduced to less than half its Hit Points, or immediately upon being damaged by a critical hit, its construct armor breaks and its Armor Class is reduced to 20.

Construct Armor

1 to 3
Frequency once per day
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Effect The Kayajima guardian pulses with mystical energies that emit a pale blue glow before it emits a wave of force. If the Kayajima guardian uses 1 action to use, it unleashes a powerful blast that deals 3d6 force damage to all creatures in a 15-foot cone. If the Kayajima guardian uses 2 actions to use Ley Line Surge, increase the size of the cone to 30-foot cone and the damage to 5d6 force damage. If the Kayajima guardian uses 3 actions to use Ley Line Surge, increase the size of the cone to 60-foot cone and the damage to 6d6 force damage.
Each creature in the area must attempt a DC 19 Fortitude save.
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Critical Success The creature is unaffected.
Success The creature takes half damage.
Failure The creature takes full damage and is pushed 5 feet.
Critical Failure The creature takes double damage and is pushed 10 feet.

Ley Line Surge

The Kayajima guardian propels itself with jets of blue energy from its feet, dashing up to a foe and swinging its fist. It Strides twice. If it ends its movement within melee range of at least one enemy, it can make an energized fist Strike against that enemy.

Sudden Charge

Kayajima Guardian Dogu (3-4) - construct, earth, mindless

1 to 3
Frequency once per day
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Effect The Kayajima guardian pulses with mystical energies that emit a pale blue glow before it emits a wave of force. If the Kayajima guardian uses 1 action to use, it unleashes a powerful blast that deals @Damage[3d6[force]|options:area-damage] damage to all creatures in a @Template[cone|distance:15]. If the Kayajima guardian uses 2 actions to use Ley Line Surge, increase the size of the cone to @Template[cone|distance:30] and the damage to @Damage[5d6[force]|options:area-damage] damage. If the Kayajima guardian uses 3 actions to use Ley Line Surge, increase the size of the cone to @Template[cone|distance:60] and the damage to @Damage[6d6[force]|options:area-damage] damage.
Each creature in the area must attempt a @Check[fortitude|dc:19|options:area-effect,damaging-effect] save.
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Critical Success The creature is unaffected.
Success The creature takes half damage.
Failure The creature takes full damage and is pushed 5 feet.
Critical Failure The creature takes double damage and is pushed 10 feet.