4 Realms picking on 1 Realm is not the way to win friends and influence people, if thats the case. 
1 superpower surrounded by sea picking off a realm battered and left in ruins by the invasion, breaking a humiliating peace treaty doing so, isn't really a great way to make friends either. Rio is the top military power of the continent, and Enweil is the second-weakest.
Rio deserves no pity. Invasion after invasion, they are left stronger and stronger, while Enweil was left weaker and weaker. Enweil lost Fwuvoghor, Fengen, and Enweilieos to the daimons, had Iato and Fheuvenem brought to ashes, and recovered a pile of ruins called Ete. Rio Got basically all of the lands from Irombrozia and Kindgom of Alluran. All in basically pristine condition.
Even with the large coalition against them, the odds remain in Riombara's favor.
Poll