Acheron's Judgement

Background:

Acheron's Judgement is a legendary warhammer forged in the infernal forges of the plane of Acheron, where ceaseless conflict and the clash of steel against steel are eternal. This warhammer was created by Nomog-Geaya, the hobgoblin god of warfare and authoritarianism, from a shard of the very iron cubes that drift through Acheron’s iron skies. It was wielded by his chosen in the infernal wars before being lost during a catastrophic planar upheaval. The weapon has since resurfaced, its malevolent presence sought by those who desire its formidable power.

The warhammer is imbued with the essence of Acheron's never-ending war, making it a formidable tool in battle. Its surface is etched with infernal runes that glow a dim red, pulsing with the heartbeat of a thousand battles. The head of the hammer is shaped like an iron cube, its faces covered in jagged spikes that mirror the brutal landscape of Acheron.

Features:

Weapon (warhammer), legendary (requires attunement by a creature of lawful alignment)

Properties:

• Magic Weapon: Acheron's Judgement is a magic weapon that grants a +3 bonus to attack and damage rolls made with it.
• Force of Acheron: When you hit a creature with this warhammer, the target takes an extra 1d8 force damage.
• Staggering Strike: When you hit a creature with this warhammer, the target must succeed on a DC 16 Strength saving throw or be knocked back 5 feet and have disadvantage on their next attack roll. You can use this feature a number of times equal to your proficiency modifier. You regain all expended uses when you finish a long rest.
• Echoes of Conflict: As an action, you can strike the ground with Acheron's Judgement, causing a shockwave in a 20-foot radius. Each creature of your choice within that area must make a DC 16 Constitution saving throw, taking 4d8 force damage and being deafened on a failed save, or half as much damage and not being deafened on a successful one. Once you use this feature, you can't use it again until you finish a long rest.
• Acheron's Shield: While holding Acheron's Judgement, you can use your reaction to gain resistance to one type of damage (chosen when you use this feature) until the start of your next turn. 
• Aura of Battle: The warhammer emanates an aura of martial prowess. Friendly creatures within 5 feet of you gain a +1 bonus to AC. This aura functions only while the warhammer is on your person.

Proficiency with a Warhammer allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Damage: Force, Damage, Combat, Versatile, Push