Well, considering Perdan's destroyed Eponllyn in several wars, is a complete powerhouse right on their border, and Eponllyn is a bit player now, I doubt they feel too suicidal. And considering that Garas/Oligarch left Eponllyn out to dry with Perdan out of greed for Krimml, when Sirion was cooperative with uniting with Oligarch/Eponllyn/Nivemus against Perdan. I'm not surprised if Eponllyn has decided returning the favor to Oligarch is a better target than being raped by Perdan all over again.
