This is what i know so far on monsters from the battle site profile page from the announcements

User ImageFluff

User ImageGarlic

User ImageAlarmskeeter

User ImageLaceback Bootsnake

User ImageClutch

User ImageOMG

like theres those but, are there gonna be more monsters with more hp and damage and like monsters that drop only certain rings and different rating to get a ring for each monster? Like bosses are they gonna drop rings that cannot be found on a normal monster with a certain percentage?.. and monsters that are rare to find and harder to kill with rings you cant find from regular monsters too??