This massive tome appears to be made of solid gold, though the metal is harder than any gold. The book itself is about 2 feet tall and 1.5 feet across. The heavy pages, what can be seen of them, appear to be at least 1/4 inch thick slabs of gold themselves. It is hard to tell, for the tome is sealed with a thick clasp. In the center of this clasp is a circular hole, roughly 4-6 inches deep and about 2.5 inches across. The key for this clasp is a large rod, almost 3 feet long. When the key is inserted into the clasp and turned, rather than unlocking the clasp, it is itself locked into place. Hefted in this way, it takes on the approximate look of a warhammer, emblazoned with both the symbols of the Allhammer himself, as well as the official seal of the ancient dwarven alliance of Ruhn-Shak. 

Gives proficiency with warhammers

Counts as a +1 Warhammer.

Spell Reflection

While wielding this hammer, you may use your reaction to attempt to redirect a spell cast directly at you (not area of effect). Make an attack roll against the incoming spell. The DC for this roll is equal to 8 + 2x the level of the spell (i.e. a 5th-level spell would have a DC of 18). If you hit with this attack, the spell has no effect on you and instead targets another target of your choice within 60 ft. using the slot level, spell save DC, attack bonus, and spellcasting ability of the caster. Once you use this property, it cannot be used again until your next long rest.

Holy Smiths attuned to this weapon gain the ability to forge zephyrium, and can use their Channel Divinity abilities, such as Artisan's Blessing, in half the normal casting time. 

Awakened

When Awakened, the clasp on the monstrous volume opens, allowing the wielder a glance at the divine inspiration of the Allhammer. The first few pages reveal themselves, but a character who tries to go beyond instantly forgets anything on the remaining pages. After a glance at this divine writing, the Opus seals itself again. When a character Awakens Soul Forger's Opus, apply the following changes to the item's traits:

• Increase the bonus to attack and damage rolls to +2.
• The Spell Reflection ability can now be used to reflect spells cast at allies within 5 feet of you.
• Your can now activate your Artisan's Blessing in 1 minute.

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, dwarf; alternatively paladin, cleric, or other holy class bound to a dwarven god, Damage, Combat, Versatile, Push