Li Li and Hongmian already had a complete grasp of the Concealment Technique.
Following Liu Qingyun's instructions, Li Li flicked his finger to cast a fireball spell with a crisp *pop*, igniting the bamboo slip until only a pile of ashes remained in a matter of moments.
Li Li couldn't help thinking to himself: "Who says minor spells are useless? Who calls them chicken ribs? I'll fight anyone who says that. Look at this, isn't getting rid of a corpse and destroying the evidence a wonderful thing?"
Chapter 44