Goblin

Goblins have yellow dark power.

A leader of goblins is called "harubang". Globlins purely and thoroughly follow the nature of power. So if someone challenge a goblin to a duel and win, the goblin will follow the winner as his new harubang and the law.

Swearword gang was a gang of goblins.

Each goblin has horns on his head which represents his solidarity with the rest of the goblins. If the horns were cut off then he no longer have to follow the rules of the goblin.

Goblins are able to use magical skills.