Souls of Elysium

This quest starts in Draconia by speaking with An Old Dragonlord.

Player: hi
Player: mission
An Old Dragonlord: FOR THOSANDS OF YEARS WE DRAGONS HAVE WATCHED THIS REALM ACTING ONLY AS NECESSARY 
  TO MAINTAIN PEACE AND BALANCE. DUE TO OUR PASSIVE NATURE, MANY OF OUR KIND HAVE NOW PERISHED OR BEEN 
  FORCED INTO EXILE BY THE VILE DEMONS OF ZATHROTH.. EVEN OUR GREATEST KINGDOM OF DRACONIA LAYS BARON AND
  LITTERED WITH THE REMAINS OF OUR FALLEN KIN. WE MUST ACT AT ONCE IF YOU WISH TO STOP THE SPREAD OF TERROR
  AND SAVE THAT WHICH YOU HOLD DEAR, WILL YOU HELP US TO RESTORE OUR HOMELAND AND BRING DOWN THE MINIONS OF
  ZATHROTH BEFORE THE DARKNESS CONSUMES US ALL?
Player: yes
An Old Dragonlord: THIS PATH WILL NOT BE EASY, MORTAL, BUT FOLLOW MY INSTRUCTIONS AND I WILL TEACH YOU HOW TO
  RELEASE YOUR INNER FIRE AS A DRAGON DOES..ALAS, THE YEARS HAVE TAKEN QUITE A TOLL. I WILL NEED A 
  POWER CRYSTAL TO REGAIN MY ENERGY..THERE ARE WHISPERS OF A POWERFUL CRYSTAL TRAPPED INSIDE A WIZARD'S
  CHEST SOMEWHERE BEYOND THE MAZE OF LOST SOULS.. LOCATE THIS CRYSTAL AND BRING IT TO ME SO I MAY HARNESS
  ITS ENERGY! the blue crystal.

After getting through demona, click the chest to receive the blue crystal .

Bring the crystal to An Old Dragonlord.

Player: hi
Player: mission
An Old Dragonlord: Did you get the blue crystal?
Player: yes
An Old Dragonlord: EXCELLENT (crushes the crystal, consuming its energy) SO MUCH POWER! I FEEL LIKE
  A YOUNG DRAGON ONCE MORE!!! THANK YOU HUMAN! YOUR NEXT MISSION IS TO ELIMINATE 400 LAVA DRAGONS.

Player: hi
An Old Dragonlord: GEETINGS MORTAL! HAS OIN SENT YOU? OR HAVE YOU COME TO ASK FOR A MISSION?
Player: mission
An Old Dragonlord: Did you kill 400 LAVA DRAGONS?
Player: yes
An Old Dragonlord: EXCELLENT... YOUR BLOOD IS TRULY THAT OF A DRAGON... MAKE YOUR PREPARATIONS AND ASSEMBLE
  YOUR TEAM.. THIS WILL BE YOUR HARDEST MISSION YET! WE MUST MAKE OUR MOVE! CONSUME THIS CRYSTAL AND YOU WILL
  HAVE THE ENERGY TO PASS THROUGH THE BARRIER! GO INTO THE CAVE BELOW AND DESTROY OUR FORMER BROTHEREN THAT
  HAVE FALLEN TO THE DARKNESS a dragon blood.

Consume the crystal by using it.

You feel a radiant energy rush through your body.

This will give you access to Zathroth.

Player: hi
Player: mission
An Old Dragonlord: Did you get a dragon blood?
Player: yes
An Old Dragonlord: AMAZING HUMAN! PLEASE ACCEPT YOUR REWARD.