Mannen D-rank no Chuunen Boukensha, Yotta Ikioi de Densetsu no Ken wo Hikkonuku - Vol. 2 Ch. 10 - Scorching Battle

[squerl]

"...so this is poison..."
"Don't worry! I've granted you resistance to poison!"
"Ah! I no longer feel the poison! You bastard, using poison on me...."
"What?! You've resisted my poison? Impossible! Well, I'll just have to use a stronger poison!"
"POISON!?!? ...will you be all right??"

this chapter

 

[Dragonbolt03]

@Velsy you also have to consider the possibility of blunting it, and causing it to be more suspectible to shattering