Diane & Matrona vs. Gannon & Holy Knights

Diane & Matrona vs. Gannon & Holy Knights was a battle fought by Diane and Matrona against Gannon and an army of Holy Knights.

Prologue
After Diane returned back to Megadozer, she hears the death of her friend, Dolores, and Matrona assigns them to meet with some Liones Holy Knights to subdue some of the savage tribes. When Matrona and Diane arrive to an unknown location, they get greeted by Gannon, one of the Holy Knights. Matrona can't sense the presence of any savages tribe. Gannon tried tricking Matrona by making it seem like he could sense where they are. It was all a trick as Matrona was trapped by Gannon's "Hollow Sound" hoping this would get a higher rank.

Battle
Even though Matrona got trapped, she freed herself with her Creation ability. The giantesses use their ability to defend themselves from giant arrows. However, there is one arrow that got through their defenses. Diane tries using "Heavy Metal" to defend herself, but Matrona sacrificed herself. The arrow is sealed with deadly venom that can penetrate in even the smallest scratches. Matrona then kills Gannon with 329 other Holay Knights while in her "last" moments.

Aftermath
Matrona tells Diane that she trains her to fight so that she could raise her to be a strong woman considering all she knows is to fight. Diane lives in agony while some Holy Knights come to report Diane's false actions of poisoning Matrona and then murdering 330 Holy Knights. The Kingdom of Liones sentences her to death, but Meliodas holds the sentence in the name of Baltra Liones so she could join the Seven Deadly Sins.

Meanwhile, Zarpa finds Matrona lying around and treats her wounds for three days straight without rest.