One year later, Yyrkoon decided to self-record the first 5-song demo tape, Oath, Obscure, Occult…, which included unique sounds to typical death metal like female vocals, violin, and flute.
After a difficult search, François Falempin joined on guitar while Kristofer Laurent was fired and replaced by Victorien Villchez.
Yyrkoon began touring with other well-known European bands such as Septic Flesh, Misanthrope, Aborted, Gojira, Scarve, and Mercyless.
Following a show in Paris in 2001, Yyrkoon met Stéphane Brulez, manager for the label Anvil Prod, who gave the band a two-album deal.
After a year of touring, the band was placed on hiatus in late February 2007 due to Souteryand's lack of motivation and enthusiasm.