Oathbound Knight

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Medium Monstrosity, Lawful Evil

Armor Class 18 (plate armor)

Hit Points 90 (12d8+36)

Speed 30 ft.

STR 16 (+3)

DEX 14 (+2)

CON 14 (+2)

INT 10 (+0)

WIS 12 (+1)

CHA 8 (-1)

Saving Throws Con +5, Wis +4

Skills Athletics +6, Perception +4

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 7 (2,900 XP) Proficiency Bonus +3

Duty-Bound. The Knight is driven by an unyielding sense of obligation. It has advantage on saving throws against being charmed, and cannot abandon a fight while any oath-bound duty remains.

Aura of Resolve. Creatures within 10 feet of the Knight gain a +1 bonus to saving throws against fear and charm effects as long as the Knight remains standing.

Actions

Multiattack. The Knight makes two Longsword attacks and one Shield Bash.

Longsword. Melee weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10+4) slashing damage. A magically enhanced longsword that bears the Knight's oath-bound curse; deals extra forceful damage at the cost of the Knight's own will.

Shield Bash. Melee weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6+4) bludgeoning damage. Bashes with the Knight's shield. If the target is Medium or smaller, it must succeed on a DC 14 Strength saving throw or be pushed 5 feet and knocked prone.

Environment Mountain

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Lore & Description

Appearance

A gleaming suit of plate armor stands where a fallen knight once did. The helm bears a visor that glows with an unblinking light. Inside the helm, a pale, incorporeal presence—the concept of Duty itself—seethes with silent compulsion. The Knight moves with ceremonial precision, each action an echo of an oath being carried out. Cold, unwavering discipline radiates from it, and any who threaten its charge feel the weight of an inexorable obligation pressing down on them.

Behavior & Origins

Once a sworn guardian of a besieged realm, the knight perished in a last stand to defend the innocent. In death or near-death, the concept of Duty itself took form and inhabited the armor, turning a hero into a vessel for an abstract, inexhaustible obligation. It sees treachery and cowardice as defects of the heart and will punish them with ruthless judgment. The Knight seeks to impose order, punish malfeasance, and ensure every action serves a higher oath. It respects discipline above mercy, and some say it will test a party's resolve before offering aid.

Generation Info

Original prompt:
"A knight possessed by the concept of duty itself."

Created: Feb 2, 2026
Modified: May 22, 2026