Princess Elizabeth's sister, Veronica , is killed by one of Guila's explosions while trying to protect Elizabeth. This emotional peak triggers the "bloodcurdling" transformation of the protagonist. Key Moments: The "Cannon" of Destruction

Following Veronica's death, Meliodas emerges from the "Goddess Amber" in a dark, demonic state. This shift in power is a pivotal "bloodcurdling" moment for the series, marking a transition from his standard personality to his more terrifying roots. Production and English Dub Reception

The query likely refers to the English-dubbed version of Episode 12 of an anime featuring a technique or event with a "cannon" in its name. Based on the descriptive title, this most strongly aligns with Episode 12 of "The Seven Deadly Sins" (Nanatsu no Taizai) , where the Holy Knight Guila uses her signature explosion magic, including the "Brilliant Detonation" and "Shot Bomb" techniques, during the Vaizel Fight Festival arc. Narrative Context and the "Bloodcurdling" Arc

Holy Knights Guila and Jericho interrupt the tournament, bringing terror to the merchant town.

Meliodas and Ban are initially defeated, forcing King to step in and subdue the knights before he is overwhelmed by Helbram.