Hashmal is fought during a regular playthrough of the story. He is on the 90F of the Third Ascent of the Pharos at Ridorana.
Hashmal is located near the top of the Pharos in a room called Heaven’s Challenge.
Level: 50
HP: 209,060
Steal: 
Leo Gem (55%), 
Hi-Ether (10%), 
High Arcana (3%)
Prepare your party by casting the standard assortment of buff spells: 
Protect, Shell, 
Bubble and 
Haste. Bubble will be particularly important during this battle as Hashmal can cause the Disease status effect with its regular attacks. Have your characters equip a 
Bubble Belt or have your healer cast Bubble on all of them to prevent Disease.
This is a fight where you will want to add another beneficial buffing spell to your arsenal. Cast Float on all of your party members which will prevent Earth-type Magicks from affecting them. This will prevent Hashmal’s Quakeja attack from doing any damage to your party.
Dispel Hashmal of its positive status effects at the beginning of the fight and be prepared to take a fair bit of physical damage. You should have your tank equipped with strong equipment and make sure to use Decoy on that party member to have Hashmal focus its attacks. It will do more damage once its HP falls below 50% and will start using a new move called Roxxor once its HP falls below 20%.
A video of the battle in the Zodiac Age version is included below:
Congratulations – you now have Hashmal as an Esper which you can use in battle!
Hashmal has two Earth-type attacks. The first, his standard attack, is called Roxxor and it deals damage to one target. The second, his ultimate attack, is called Gaia’s Wrath, which deals Earth-damage to all foes in range.
Unlocking Hashmal on the License Boards of certain jobs will unlock additional License Boards:
Makara)Confuse, Faith), White Magick 9 (Bravery, Curaja)Cura, Raise)
StealBonecrusherBonecrusherThe optimal choice is to give Hashmal to your Knight as this will give them access to Faith and Bravery, as well as a myriad of other White Magick spells.
Second to this would be to give it to either your Foebreaker or Time Battlemage for the Swiftness/Channeling Licenses.
