Mangos Where Are The Big Monsters?!

[Bcasper11]

I Need Help With The Big Monsters You Fight For Quest Like Grik'nir the Cold In The Quest "The Stolen Journal" and I Can't Finish My Quest That Have Bosses In Them Soo I'm Stuck. All The Small Monsters Are There Tho... I Need HELP :​

 

[Darkicon]

Be a little more specific as to the problem.

Do you not get kill credit? Are you unable to turn the quest in? Is the monster spawned?