"Well, at least we won't be difficult to find the bling Solitaires in the Library. It won't be HARD. [BAZINGA]"Cegorach, the Laughing God, is the Eldar God of art and trickery.
Official Canon Edit
Cegorach is the protector of the Black Library, hidden deep within the Webway, which contains all knowledge about Chaos. Only his Harlequins and a select few individuals are permitted to enter the library.
During the War in Heaven, Cegorach dealt a blow against the Necrons by tricking the Outsider into eating the other C'Tan. During the Fall of the Eldar, he was one of the few surviving Eldar Gods, disappearing into the Webway to escape Slaanesh.
Cegorach is constantly working to defeat Slaanesh and save the Eldar. His Harlequins are Eldar who have forsaken their previous lives to serve him, and act as ambassadors and emissaries.
TTS Canon Edit
Cegorach prevents Ahriman from entering the Black Library, toying with him and his men before throwing them out. However, he also encounters Wamuudes and Custodisi. Cegorach mistakes them for Solitaires trying to play a prank on him, and proceeds to say corny puns before Ephrael Stern shows up to berate him for his terrible food. He sulks off and allows the two Custodes to enter the library.
Cegorach as a spectral audience that laughs at his jokes, as well as a disembodied voice that adds "[BAZINGA]" to the punchline.