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They both betrayed him at different occasions, baran betrayed him during the Great War with the absolute being, the monarch of fangs didn’t quite betray him since they were never ally. They betrayed the agreement to not touch each other (monarchs) by plotting with the monarch of frost to kill ashborn before his complete reincarnation (Jin woo) and intervening on earth, ashborn’s territory if i remember correctly, given by those winged bastards after betraying him (the tried to kill him, did actually, he just came back as the shadow monarch, after killing the absolute being, with the complicity of baran)
Wasn’t the Monarch of Fangs the coward and hypocrite who betrayed Ashborn?