Lords of Havoc
Laughing Coffin is an assassins guild that is based in Grand Duchy of Barsuk the Northern province of the League of the Fangaerian City States.
Part of their method is to inflict terror on their victims as they kill them. They are all masters of poison use and favor poisons that cause paralysis. After they paralyze their target they kill them in a slow and painful manner.
They also operate in three to four man teams. Additionally they never give up on a contract until it is fulfilled. Beyond that there is very little information know about the guild.
Their symbol is a black coffin with the lid slightly open a laughing face upon the lid and a skeletal arm sticking out.