From Everything (Ch.541)

The strange liquid in the pond was perfectly still, as it had been since the first moment Azkar arrived there, 

But all of a sudden, it began to churn, finally giving a reaction just when Azkar had concluded he would be unsuccessful.

Azkar turned to the pond, his eyes settled on the rune, still dyed red with his blood. 

The rune had begun to glow dimly, reacting to Azkar's blood a complicated expression reflected in Azkar's eyes.

Azkar took a few steps back, watching in silence as the pond became violently troubled, swirling about a particular axis.

The swirling grew increasingly faster, almost creating a semblance of a whirlpool down to the depths of the pond and then it stopped, just as suddenly as it had begun.

Azkar waited, with undeniable apprehension. He had watched this happen once before but never had he summoned one of the dark lord's pets by himself.