The attack Enweil was not authorized by Enweil. You went and smashed up their army for no good reason. Or rather, for selfish reasons, because you wanted to takeover Lopa for yourselves. Was the declaration of war from the previous ruler illegal? Who cares. Your whole army followed that command. Everyone could have decided "No, I am not attacking a human realm during an invasion". You didn't.
Never heard of infiltrators working against Fheuv'n? What, do you think your rulers are actually honest with you? The very moment your army entered our land, one of your infiltrators was seen doing sabotage. And don't think we didn't denounce it.
Rio's accusation are ridiculous.
Lack of cooperation?
Riombara was the one who used religion to harm Fheuv'n and Enweil for as long as it could.
Riombara was the one who sent her army to attack Enweil.
Riombara was the one who kept sending infiltrators against us.
Riombara was the one who kept disrespecting our request to stay out of our lands.
Dealings with the daimons?
Fheuv'n was the one who kept getting brutalized by daimon armies.
Fheuv'n was the one who saw their lands get blighted every week or so.
Fheuv'n was the one whose capitals were being sacked on a bi-weekly basis.
Fheuv'n was the one who got completely wiped off by the daimons.
What was supicious was that I told Riombara we had daimons attacking us. They didn't believe us, so I told them to screw themselves. Then they send a spy in our lands to see if what we said was true, but the spy arrives shortly after the daimons start moving North. We tell them that the daimons moved north, to go screw themselves, and to not enter our lands. They ignore us, and send their army towards Fheuvenem despite both their scout and myself telling them there are no more daimons in my lands. They arrive in our lands, and immediately start sabotage actions. I tell them the daimons are gone, and to go screw themselves (as I rally our battered armies to prepare Fheuvenem for a siege by Riombara). Riombara ignores our requests, say they will continue forward. Next thing you know, daimons are attacking them, and they are blaming us for it.
Honestly, I still suspect the reason you were there to begin with was to siege Fheuvenem to shut up Guillaume once and for all. Guillaume told Riombara numerous times that he didn't want their help, and that the daimons were leaving his lands for the Northern blight. Riombarans decided to ignore him and keep marching towards us. Had you listened, your army would have been at home, ready to fend off the daimons.