Three Sword Paths To Heaven

When the Lich finished chanting, he raised his wand and intense magic power began to radiate to every corner of the hall. 

The spreading of magic power began to create magic circles.

Numerous magic circles appeared on the floor. The magic circles that appeared were so numerous that they almost filled the floor of this place. 

Not long after, various undead monsters started appearing from the magic circle. 

The first to be seen are the hands, followed by the head, until the rest of their body starts to show little by little.

Clack! Clack! Clack! …

Whenever the skeletons move, they make a sound similar to that of bones breaking.

When the complete bodies of all the skeletons surfaced, I could slightly identify what kind of skeletons they were. 

Skeletons of Goblins, Wild Boars, and even a skeleton made of Batting Squirrels exist. I identified them by the size and shape of their bones.