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There is a Legacy version here.

Adamant Sentinel

Crafted from a nigh-indestructible metal of great rarity, adamant sentinels can''t be destroyed except by the most powerful foes. Crafting an adamant sentinel requires a quantity of adamantine so massive that collecting it usually requires mounting a mining expedition to a distant planet, the Plane of Earth, or an Outer Plane.

Recall Knowledge - Construct (Arcana, Crafting): DC 43
Unspecific Lore: DC 41
Specific Lore: DC 38

Elite | Normal | Weak
Proficiency without Level

Adamant SentinelCreature 18

Rare Huge Construct Mindless 
Source Monster Core 2 pg. 8
Perception +8; darkvision
Skills Athletics +20
Str +9, Dex -1, Con +9, Int -5, Wis +0, Cha -5
AC 24; Fort +15, Ref +9, Will +11
HP 255 (repair mode); Immunities bleed, death effects, disease, doomed, drained, fatigued, healing, mental, nonlethal attacks, paralyzed, poison, sickened, spirit, unconscious, vitality, void; Resistances physical 20 (except vorpal adamantine), spells 20
Repair Mode When the adamant sentinel is at 0 HP, it isn't destroyed. Instead, it enters repair mode, during which it's slowed 1, can't take reactions, and can take only the Self-Repair action. Once it has more than 30 HP, it can use any type of action and can use reactions, though it remains slowed 1 and can't take any reactions until the start of its next turn. If a critical hit with a vorpal adamantine weapon reduces the sentinel to 0 HP, or if such a weapon hits it while it's already at 0 HP, the sentinel is destroyed.
Speed 30 feet
Melee [one-action] fist +17 [+12/+7] (deadly 3d12, magical, reach 15 feet), Damage 3d10+17 bludgeoning plus destructive strikeDestructive Strike On a critical hit, the adamant sentinel's fist Strike breaks the target's armor, if any, in addition to dealing damage to the target. If the target has a shield raised, the sentinel breaks the shield instead.Inexorable March [one-action] The adamant sentinel Strides up to its Speed, pushing back each creature whose space it moves into and damaging them if they try to stop its movement. A creature can try to bar the way by attempting a DC 27 Fortitude save.
Critical Success The sentinel halts its movement and cannot enter the creature’s square.
Success As critical success, but the resisting creature takes 3d10+17 bludgeoning damage.
Failure The resisting creature takes 3d10+17 bludgeoning damage, and its armor, if any, is broken. If the resisting creature has a shield raised, the sentinel breaks the shield instead.
Self-Repair [one-action] (manipulate) The sentinel repairs itself, regaining 30 Hit Points.Vent [one-action] (fire) The sentinel vents a 30-foot cone of superheated steam from its internal forge. This deals 15d6 fire damage to all creatures in the cone (DC 22 basic Reflex). The sentinel can't use Vent again for 1d6 rounds.

Sidebar - Treasure and Rewards Adamantine Hunks

The incredible amount of adamantine necessary to create a single adamant sentinel is worth more than many nations’ treasuries. The powerful heart of an adamant sentinel can be turned into a legendary forge for blacksmithing.

Shelyn's Corner

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