During Testarossa's Journey Through the Underworld, She Felt Like She Had Eyes Watching Her From Every Direction. As she reached the Demon King's castle, she noticed. The door was open, and coming from inside, she smelt the rotting corpses. She made her way through the castle and saw corpses all over the place. Once she reached the throne room, she felt a darkness around the space. Her eyes widened as Testarossa saw the rotting corpse of the overlord of the underworld, Nezha. Agera slithered out of the Testarossa jacket and said, "Testa What Now? We came here to speak with him, but it looks like someone got to him first." Testarossa took a deep breath and let out a sigh. She rolled up her jacket shelf and hovered her hands over Nezha's corpse and used a flame spell called "Warming Sense." A small flame came out of her hand. Black particles started to come out of the corpse and flow into the flame. Testarossa closed her eyes and suddenly opened them as she said, "This is..." Suddenly multiple spikes appeared from behind Testarossa. Agera used his tail to deflect the spikes. As she slowly started turning around, she said, "I thought I felt the presence of a serpent nearby." Once she fully turned around, a gigantic white serpent appeared in front of her. Agera slithered on the floor and increased his size to match that of the other serpent. He said, "Vritra… I thought you were dead? Testa, be careful; he's also a Serpent God." Testarossa didn't speak a word. Then Vritra spoke in a corrupted-like voice. "Soon both of you will be nothing but rotting corpses. You will fall to the Serpent God of Poison, Vritra!" Vritra slithered towards them at high speed, jumping into the air before crashing down. Agera opened his mouth and breathed a massive amount of fire towards Vritra. The flames from Agera are scorching hot, but the Vritraitra Gem in his head shone bright white, and the flames started to fade. Agera looked surprised, but Vritra crashed into him and slithered around his body and pierced his fangs into Agera's neck, injecting him with a powerful poison. As Agera started to become weak, Vritra felt a tight grab around their neck; before he could turn, he was thrown through the castle walls, destroying multiple walls before he landed at the entrance of the demon king's castle. As he recovered, he noticed a ginormous flame coming towards him as Testarossa appeared in front of him, saying, "A serpent that is known for poison—it all makes sense now." She started laughing hysterically. Vritra had time before spitting poison directly onto Testarossa while the poison moved quickly through her body. Purple veins appeared across her body as she started to get super pale. As Vritra was about to speak, Testarossa jumped in front of him and started rapidly punching him in the head with flaming fists. With every strike, Vritraa felt like his body was being hit by the heat of the sun as his head crashed into the floor. Testa stepped on his head. "Your body is immune to anything corrupted, so that means you're the creature that's causing the abyss to spread…" As she looked at his white scaly body, she noticed abyssal mana coming off his body. Testarossa let out a massive flame explosion and said, "You can be of great use to me… I am going to give you two options. One, serve me and become my ally, or I will burn you to ash, leaving nothing but your legend alive…" Vritra felt the heat of multiple suns's pressure crushing his body. As he said, "I will serve you." Testarossa removed her foot as Agera slithered back over to them. But then a massive abyssal tornado appeared behind them. As Rinko was hovering midair. She said, "It's been a while, Testa, but now isn't the time to catch up." Testarossa summoned Tsuno, and she clashed with Rinko in the sky. But before she could land a strike, white tendrils came out of Rinko's back, knocking her to the ground. Rinko laughed and said, "Sorry, but you will take too much time to kill, and I am running out of time. It's time for humanity to be consumed by the abyss…" As she floated in the air, she summoned a massive Abyssal gate, which she opened and said, "Take this as a parting gift: one million Abyssal demons…" As Rinko vanished, a gigantic number of demons headed towards Testarossa. Vritra and Agera said, "What shall we do, Testa?" but she didn't respond and started laughing hysterically. Then a gigantic flame appeared around Testarossa's body. As the flame kept getting bigger and bigger, she said, "One million demons just for me? It would be my pleasure to turn them all to ashes…" Testarossa used a Grand, which is one of the most dangerous spells; she used a Grand Flame spell called "Afterburn." A massive wave of flames came crashing down onto the demons, killing thousands of them in a single blast. Vritraa looked surprised and said, "That heat was about 180,000°F. How incredible!" Testarossa smiled psychopathically and said, "Enough talk; let's slaughter these demons, and then we head to the human realm." Testarossa, Agera, and Vritra stand fighting the thousands of demons left from the afterburn explosion.
