Princess Cannon
From Inkipedia, the Splatoon wiki
The Princess Cannon is a special weapon in Splatoon 2. It is not part of any main weapon's set, and is instead only available in the final Shifty Station layout, MC.Princess Diaries, where it appears in the middle of the stage when there is one minute left until the battle ends.[1] It is similar in appearance and function to the Killer Wail from Splatoon, although the beam is much larger and it takes a little longer to charge up.
Splatoon 2
Gallery
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Weapon icon in the HUD.
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Weapon icon in the "splatted by..." message.
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Callie sitting on a Princess Cannon.
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Spyke carrying a Princess Cannon.
Names in other languages
Translation notes