Legend Skill

lobotomy

I have problems with legendary skill.(If anything I may have problems with English because I from Russia) ."lvl 185" I have a task to kill Degos 10 pieces , but when I kill the tasks don't enroll .I tried to kill him with my friends and alone, but nothing changed.I do not understand what the problem is, my level 198, but the task is not performed .I thought I was killing the wrong boss, but I even watched the video and I had to kill him .Help me please, I can not move in the legendary skill :(