This is infernum the special kido that Kioshi Mamaru created along with help from Tessi and Hachi. It essentially allows the user to summon and manipulate (imitation) Hell Fire. The power of the spell can be increased by adding your own reatsu to it. It is on the forbidden kido list (central 46 doesn't understand the difference of imitation and real hell fire) although the creators and the people who knew how to use it before it was added are exempt from the ban.

It has a mostly universal incantation.

INCANTATION
Hear my call fires/flames of hell. Lend me your power so I can protect those I care for and burn everything and everyone that stands in my way to smoldering piles of ash. Infernum kōgeki/bōei Number _!

KŌGEKI (attack)
1 Neppū (hot air)
2 Honō No Hashira (pillar of flame)
3 Hinotama (ball of fire)
4 Moeru Ken (flaming fist)
5 Chi O Moyasu (burning blood)
6 Dai Monji (fire blast)
7 Hi No Muchi (fire whip)
8 Shi No Moeru Āku (flaming arc of death)
9 Shi Ga Moeru No Juuichi Hashira (11 pillars of flaming death)

BŌEI (defense)
1 Mabayui Bakari No Hikari (blinding light)
2 Hikari Ketsugō (binding light)
3 Ketsugō Netsu (binding heat)
4 Baindingu Kasai (binding fire)
5 Hikari Tōguku No Wa (circle of imprisoning light)
6 Hi O Tōguku No Wa (circle of imprisoning fire)
7 Hikari O Tōguku No Dōmu (dome of imprisoning light)
8 Hi O Tōguku No Dōmu (dome of imprisoning fire)
9 Chōeki No Teiyaku-en (contracting flames of imprisonment)