Night Child.
This is not an exceptionally rare class. While Assassin + Sword Cultivator might sound a bit redundant, many still choose it because it looks cool.
However, most who initially select this class eventually switch to another like Flying Blade or Shadow Assassin.
The reason is quite simple.
The basic skills of this class are not very effective.
[Weapon Master]
[Passive]
[Increases attack speed and damage by 20% for each different type of weapon equipped.]
[Night Walk]
[Passive]
[Increases movement speed by 20% in dark areas.]
[Activate: Blink behind an enemy in a dark area.]
[Cicada's Escape]
[Escape Skill]
[Breaks free from control and increases movement speed by 50% for 3 seconds.]
[Night Serpent Form]
[Transforms equipped weapon into a Night Serpent Whip with fixed range and damage, which increase according to equipment quality.]
...Only 4 skills.