a treant guardian  

Went in here with my 95 SK in RoF tier 1, the warden's hit really hard so I kept sham temp hp buff + stoic stance up and these guys still 1 shot me if they get enough hits in a round. My first HA with shaman/shadowknight both 95 with healer merc + dps merc. Everything was easy up until killing 5 of these.