Well it depends, I did it with my mage 4/6 + 0 a runic heal a runic tank and a full epic arch and yes we almost killed boss 1, but LOL so much stress! They told me you need to be full epic to do EHL.. But IDK i cannot tell how strong are the others 2 bosses..
None of us knew that there is a small bug, a little tiny place where you get no damage.. Yeah imagine LOL daily quest for soul wants to kill me Nechtar LOL yeah easy XD