Celtic Heroes

Are many of you finding these bosses to be way over powered? It is taking top lvl players to join up with other clans to bring them down. It took 6 outside group druids to take down Dead root. Were are finding these bosses to be over powered for lvls 90 plus. Any info or tactics to help would be nic...

For lower lvls Go work hard like I did to lvl up to get into groups stop crying. Only makes you look silly