[Primordial] Weapon - Eminence Spire

I tried out a different render method for this one. I'm not sure it's completely successful, but it might be because I didn't realize how difficult it'd be to make natural stone look imposing!

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This staff is one of four weapons wielded by the heroes of the last Awakening, used to slay the primordial titans before their disaster can befall the mortal realm. Its haft is conglomerated stone, bound by the prime earth crystals growing from its head.

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Eminence Spire
Weapon (quarterstaff), rare (requires attunement)

To attune to this weapon, you must spend the duration of the attunement period fully encased in earth at least 1,000 below ground.

Staff of Earth. While you wield this magic weapon, you gain the following benefits:  

• You can speak and understand Terran. 
• You deal an extra 1d4 bludgeoning damage to targets you hit with this weapon.
• You have resistance to bludgeoning damage. 
• You cannot be knocked prone or moved unless you allow it, provided you are standing on the ground.

Elemental Boon. While you hold this weapon, you can use an action to cast enlarge from it, targeting only yourself. Once cast, this spell can't be cast from it again until the next dawn.

Primordial Harmony. The Eminence Spire is one of four weapons created to tame the primordial titans, the others being the Arcstratos Shard, the Infernus Halo, and the Torrential Lash. This weapon grants you additional benefits while you are also attuned to any of those other weapons.  

• This weapon gains an additive +1 bonus to your attack and damage rolls equal to the number of the other attuned weapons, up to a maximum of +3. 
• This weapon's extra damage increases by one die size for each of the other attuned weapon, to a d6 for one other weapon, a d8 for two other weapons, or a d10 for three other weapons. 
• For each other weapon you are attuned to, you can cast the spell granted by this weapon's Elemental Boon property one additional time before dawn, up to a maximum of 3 times.