Zatch Bell!! - Vol. 11 Ch. 96 - The Book's Secret

[MangaDex]

 

[Gambino]

maybe this spell gives overall boost to all spells while his body is glowing

 

[Wiindows]

maybe this spell makes gash go all super saiyan

 

[PramTheOracle]

Ruku spell Huh

Ruku spells seems to modify the body of the demon, maybe it supercharges Gash with lightning power and make him super strong

 

[Sunbroski23]

holy shit!!

 

[Snuffsaid]

I'm thinking it coats his body in lightning, being a type of shell but also doing damage to those that come in contact with it?