[Cosmos] Weapon - Shockwave-ExM9

Developed by Empyrean Enterprises as special arms against the batfolk of Ch'k'aku-Beta, the Shockwave series focuses its destructive vibrations into variable shapes.

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Shockwave-ExM9
Weapon (coilgun), technomancy, uncommon (optional attunement)

Sonic Weapon. This weapon deals thunder damage instead of piercing damage. When you score a critical hit against a target with this weapon, the target is deafened until the start of your next turn.

Thunderbeat. This weapon has 2 charges and regains all expended charges daily at dawn. While wielding this weapon, you can use an action expend 1 charge to cast thunderwave from it (save DC 13). When you cast this spell, you can modify it so that it produces thunderous force in a 5-foot-wide, 30-foot-long line instead of a 15-foot cube.

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Optional Attunement. If you choose to attune to this weapon, you can magically recharge the arcane battery that powers it. Whenever you reload this weapon, you can expend a spell slot of any level to reload it instead of physically replacing the battery. The weapon also regains a number of charges equal to the level of the spell slot expended, up to its maximum.

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Shockwave-ExM90 (Rare Variant). The rare version of this weapon has a DC of 15 instead of 13, and also grants a +1 bonus to its attack and damage rolls.

Shockwave-ExM9X (Very Rare Variant). The very rare version of this weapon has a DC of 17 instead of 13, and also grants a +2 bonus to its attack and damage rolls. When casting thunderwave from it, its effect fills your choice of a 30-foot cube or 50-foot-line instead.

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DESIGN COMMENTARY

It'd be wrong to not have a sonic weapon in a futuristic cosmos theme, so here it is! It's got that bulky funky look to it to make it stand out more against the sleeker guns. Current sonic weapons are weird, too - they can sometimes just look like big flat plates.

Using the same guidelines established in the Kiloton item (an uncommon non-attunement item = ~2 casts of thunderwave), we can evaluate this as follows. This one just adds a little more pizzazz to it, a minor change comparable.