|Welkin Lightning, Demonic Rings: Firmament Incineration|
|Hangul||천뢰 마환공 폭렬대천|
|Hanja||天雷 魔環攻 爆烈大天|
|Romaja||Cheonloe Mahwangong Poglyeoldaecheon|
|Lit. English||Heavenly Thunder Devil Ring Attack Big Fierce Explosion of Heaven|
|Martial Art||Welkin Lightning|
|First Seen||Chapter 77|
|Known Users||Sa Paecheon|
Welkin Lightning, Demonic Rings: Firmament Incineration is a Welkin Lightning technique utilised by Sa Paecheon, the Devil of the Venom Hands, and also the most powerful technique of the Welkin Lightning martial arts style.
The user draws their arm back, with rings of ki swirling around their hand, and then generates a truly colossal explosion of apparently super-heated energy that radiates outwards for kilometres and destructively swallows up everything in its path. The sheer power and scale of this technique is so high that one of Sa Paecheon's subordinates likened it to a suicide attack and Sa Paecheon could be seen sweating profusely after its usage.