THE HARD PART(BELIEVE IT OR NOT)
-Just use the chat box "Looking for Group" in-game, or Neverwinter forums, find a friend.
-This is the fastest way yo can do it, I tested it and kept track.
-3 people do a private queue , 1 leaves or is kicked, you and your friend, stacked with 100's of Potions and Injury Kits, and Stat buff potions.
THE EASY PART
-Enter Karrandax Lair, kill the first 2 dragons and "Defeat self"
-Both of you will respawn outside of the Lair, re-enter and repeat.
-Do not kill Karrandex or anyother enemies it bugs the Grind and Dragons sometimes stop spawning.
-Only kill the first 2 Dragons**"Red Dragons".
-Equip High Armor Penatration gear, A must for speedy grinding.
-You can break it up into 3 days and and only do 2 -3 hours of grinding this.
-On days where your friends can't show up to help you grind, go to Neverdeath graveyard and kill Charandex Dragon he counts to, use the Map Change option and ask "Char up anywhere?" you'l get help from other players calling for Dragon slaying help themselves.
I just got this trophy a few days ago.
THE BORING PART
Time to complete grind: 10 Hours, just have fun and chat with mic's to kill the time....listen to music whatever...it will get a bit boring