Temperature

Merlin opened the glassware and saw a thick black smudge. The potion exuded a disgusting foul scent.

"Is this Coagulation Potion?"

Merlin's expression revealed his confusion. According to Wizard Howl's description, Coagulation Potion would be black and had a faint refreshing scent. How could the one he formulated end up like this?

"Let's give it a try!"

Although Merlin's Coagulation Potion seemed to be somewhat different from the usual ones, Merlin would not be at ease if he did not at least try it.

"Swish!"

Merlin used a sharp dagger to slit his arm several times without mercy. All these only led to one shallow cut, which showed how strong his current physical attribute was.