[Divine] Artifact - Crown Judgment

This warhammer is a fragment of Ondrea the Unyielding Judge, bestowed upon a worthy champion of the God of Valor and Justice. Champions who wield this hammer are charged with dutifully dispensing justice upon the world, though the type of justice is not specified. They push heroically into the unknown, facing their fears head-on.

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Crown Judgment
Weapon (warhammer), artifact (requires attunement)

To attune to this warhammer, you must spend the duration of the attunement period facing one of your fears with weapon in hand. If you are not a follower of Ondrea or her principles, you must succeed on a DC 15 Wisdom saving throw to attune to the warhammer. If you fail, you take 4d8 thunder damage and is thrown up to 50 feet away from the weapon.

Semi-Sentience. This warhammer is imbued with a portion of Ondrea's logic. Crown Judgment is a semi-sentient lawful neutral weapon with a Wisdom of 15 and a Charisma of 11. It cannot see or communicate, but can sense the intentions and actions of its wielder. If the wielder refuses to pass judgment or retribution, the warhammer subtly casts suggestion (save DC 18) on the wielder to convince it otherwise.

Envoy. The warhammer grants the following benefits while you are Ondrea's Envoy:  

• The warhammer grants you a +1 bonus to attack and damage rolls made with it. When you hit with it, you can change its normal damage type to thunder. 
• While you hold this warhammer, you can cast the thaumaturgy cantrip. 
• While you hold the warhammer, you are immune to the frightened condition and have advantage on Wisdom (Insight) checks.

Herald. The warhammer grants the following additional benefits while you are Ondrea's Herald:  

• The warhammer's bonus to attack and damage rolls increases to +2. 
• While you hold this warhammer, you have resistance to thunder damage. 
• While you hold this warhammer, you can cast the aid spell at 3rd-level. This property can't be used again until the next dawn. 

Champion. The warhammer grants the following additional benefits while you are Ondrea's Champion:  

• The warhammer's bonus to attack and damage rolls increases to +3. 
• When you score a critical hit against a target, you can choose to push it up to 15 feet away from you, knock it prone, or both. 
• You can use a bonus action to lift the warhammer skyward and imbue your allies with bravery. Choose any number of creatures within 30 feet of you. For the next minute, a chosen creature gains 5 temporary hit points at the start of each of its turns and has advantage on saving throws made to resist being frightened. This property can't be used again until the next dawn.

Destroying the Warhammer. To destroy Crown Judgment, a senior governor of the Clockwork Citadel must attune to the weapon and continuously debate its merits as a tool of judgment for 3 months. Unable to reach a satisfactory conclusion, the warhammer then disintegrates into golden dust.

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DESIGN COMMENTARY

I really wanted to make each artifact as unique as possible, so some of these artifacts are semi-sentient. Sentient artifacts also have the added benefit of allowing direct GM effect on any artifact plot.

Some may recognize Ondrea as the god whose Haloes came in different styles. I continued that design language to the hammer head, and continued the gold Aureliate design to the handle like cracks. Each God is associated with a material and damage type - Ondrea's is thunder (hence the cracks) and adamantine (hence the greenish metal).