Aura of Menace.

As long as the archon doesn't have the incapacitated condition, each creature of the archon's choice that starts its turn within 20 feet of the archon must make a DC 15 Wisdom saving throw. On a failed save, the creature has the frightened condition until the start of its next turn. On a successful save, the creature is immune to all archons' Aura of Menace for 24 hours.

Eternal Vigil.

The archon can't be surprised. Moreover, it knows when any creature uses a portal it is assigned to guard.

Actions

Multiattack.

The archon makes two Claw attacks and one Tracker's Bite attack.

Claw.

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) slashing damage. If the target is a Medium or smaller creature, the target has the grappled condition (escape DC 18). The archon can have only one creature grappled in this way at a time.

Tracker's Bite.

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 5) piercing damage. If the target is a creature, for the next 24 hours, the archon knows the distance and direction to the target while they are both on the same plane of existence.

Spellcasting.

The archon casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 15):

At will: detect evil and good
1/day each: aid, continual flame, protection from evil and good, scrying (as an action)

Teleport.

The archon teleports, along with any equipment it is wearing or carrying, to an unoccupied space it can see within 120 feet of itself.

Warden Archon