A/N: Requested by Geats-Fox, and it's actually "Yandere Childhood Friend Zhu Yuan X Obol Squad/Snake Thiren/Ethereal Member OC X Yandere Student Soldier 11 (Lemon)"
(Zhao Yun is one of the senior members of the Obol Squad and is codenamed Soldier X-0. He is also Soldier 11's sword teacher. He is a Snake Thiren, so his blood contains extremely high levels of poison. But unlike the members of the Obol Squad, Zhao Yun has the ability to switch between Thiren and Ethereal forms.)
(His files say that mother is a Snake Thiren and his father is a Hollow Raider but has been heavily corrupted with Ether, and Zhao Yun was born in a Hollow, allowing him to adapt to the high concentration of Ether in the Hollow without the need for protective gear. Unlike those who are corroded by Ether and gradually lose their minds, Zhao Yun will become exponentially stronger as he absorbs more Ether. However, it will also cause Zhao Yun himself to slowly lose consciousness and control, leading to a berserk state where he attacks everything around him.)
(One day, he received orders from the government.)
Governor: Zhao Yun, Soldier 11, I'm passing the mission for you. You are to assist the Criminal Investigation Special Response Team in cracking down on an illegal Ether Battery smuggling gang.
Zhao Yun: Understood.
(They then go to meet the team.)
Zhao Yun: Greetings. I'm Soldier X-0. This is Soldier 11.
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Zhu Yuan: Zhao Yun, is that you?
Zhao Yun: How did you-
Zhu Yuan: You're still wearing the bracelet I made for you when you were younger.
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Qingyi: (comes in) Is that everyone?
Zhao Yun: What? You wanted more?
Qingyi: Uh... whatever, let's go investigate.
(Timeskip)
(The faint hum of machinery filled the air as the Obol Squad rode into the Hollow, its twisted terrain looming ominously in the distance. Hollow Zero was a place of nightmares—corrupted by Ether, it had become a labyrinth of decaying buildings and lurking Ethereals. Zhao Yun's eyes flickered with a sense of familiarity. He had been born here, molded in the very heart of this place. Even now, despite the years and the battles that had shaped him into Soldier X-0, there was a part of him that felt like this Hollow was still home.)
