I believe that this should be on Help section, but okay.
As you may know, the Creature Shard is a 5% drop from Creature Creation.
The boss have almost 16k HP and his attacks are kind of strong. So it will be difficult to find an initial class for solo him.
It would be good if you get this drop with other players.While I was botting for Seppy Armor on Maul map, sometimes I found persons botting him.