Rikken hires you for this job, because he wants to know who's the fastest in Ivalice. You'll find him in Balfonheim. He tells you a story about mythic Pylraster and asks you to find him. But before he tells you this story he'll want to race you (details in "Rikken, Elza & Raz").
about 460 000 HP
Resistant to Libra,
Vulnerable to Fire
This enemy can be found in Pharos at Ridorana exactly in the same place where you have fought with Hydro.
At the beginning he'll attack you using Ram, Crushing Fangs (which may cause Death) and Screw Tail (it inflict damage upon those standing in front of him). His attacks are very strong but fortunately the also damage the attacker.
Somewhere around 50% of his HP, Pylraster will use Growing Threat increasing his level twice. He'll also begin to use Rage damaging everyone around him. Additionally after that first 50% his Defense and attack speed raise.
For this fight you could use Fomalhaut and Wyrmfire Shot or Sagittatius and Fiery arrows for the healing mage, black mage should attack using Ardor and one character should wield Masamune, Genji Armor, Genji Gloves and be under effect of Bravery, Berserk and Haste. Then all you'll have to do is to look out for his HP level.
Bounty: 8000 gil, Grand Mace, 2x Scathe Mote