[Primordial] Weapon - Torrential Lash

The fourth and final weapon of the primordial set. Mirror Image is a pretty great spell on its own. I initially designed the look to be more akin to a stream of water, but changed course later on when I realized it did not look as powerful as would a stream of seawater, more akin to the tide.

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This whip 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. Icy spikes jut from the end of this whip's meandering tidal length.

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Torrential Lash
Weapon (whip), rare (requires attunement) 

To attune to this weapon, you must spend the duration of the attunement period fully submerged in water at least 1,000 below sea level.

Whip of Water. While you wield this magic weapon, you gain the following benefits:  

• You can speak and understand Aquan. 
• You deal an extra 1d4 cold damage to targets you hit with this weapon. 
• You have resistance to cold damage. 
• When you hit a Large or smaller target with this weapon, you can choose to deal no damage and move it up to 5 feet in a direction of your choice.

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

Primordial Harmony. The Torrential Lash is one of four weapons created to tame the primordial titans, the others being the Arcstratos Shard, the Eminence Spire, and the Infernus Halo. 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.