Killer Wail

Killer Wail is Inkling's Final Smash in Super Smash Bros. Ultimate.

Overview
Inkling will place the Killer Wail down, pointing in the direction he or she is facing. After warming up for a bit, the Killer Wail will fire a massive beam of sound energy that traps any opponent it catches and repeatedly damages them. It will slowly pan upward before ending, and its last blast will deal significant damage and knockback. After bringing out the Killer Wail, Inkling will be able to move around while it is operating and attack opponents or force them into the Killer Wail's blast.

Origin
The Killer Wail is a special weapon in Splatoon.