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You seem a great warrior, but it is best you avoid Zertinan Caverns. There are many fell creatures there, and of late, worse...
Zertinan Caverns is an optional area and can be deadly for a party wandering inside too early in the game, so it is suggested that a party of at least an average level of 20+. The EsperAdrammelech can be found inside, as well as numerous Hunts and Rare Game.
A great cavern complex stretching along the length of the inland sea between Ordalia and Kerwon. Its passages twist and turn, winding their way from the Jagd Yensa to Dalmasca, and even Bancour. Labyrinthine and dark, the caverns provide an excellent place for criminals and bandits to hide from the authorities. The reaches near the Great Yensan Sandsea are known for their frequent deadly subterranean sand drifts, and the fierce wyrms that make their home there. Nearer to the Bancour, the smell of brine grows stronger, and many of the cavern mouths open out onto cliffs overlooking the sea.
In Invitation to Heresy a treasure along the southwestern wall can be the Barbut. In the Sandfalls, the treasure in the northeast corner can be the Iron Hammer, but the player must open a path by rolling down a boulder to build a bridge to get there.
In the northeast of the Drybeam Cavern the player may find the Feathered Cap. In Halls of Ardent Darkness, which exits to the Ozmone Plain, a treasure can spawn with the Traveler's Vestment in the east of the area.
Adrammelech is an optional Esper, but to obtain him the party must defeat him as a boss in the Athroza Quicksands area of the Zertinan Caverns. He is a flying opponent who uses Lightning, and as soon as the player steps into the area, Shambling Corpses will emerge out of the ground and will keep on spawning at deeper areas of the cavern. This makes it an okay grinding spot after Adrammelech has been felled.
The Marilith is a Rank V Mark that becomes available after vanquishing the Wyvern Lord. The hunt is petitioned by the tavernmaster in Rabanastre's Sandsea bar. The Marilith is found in the Invitation to Heresy area of the Zertinan Caverns, in the sunlit room (bottom right portion of map, where the shape of the room looks like the letter "C"), but the party must remain in the area for five minutes before it will show up.
The Catoblepas is a Rank VI Mark whose hunt becomes available after the events in Giruvegan. Catoblepas can be found in the Hourglass Basin area and is petitioned by War-chief Supinelu in Jahara. Once in Hourglass Basin, the player must use the south exit to The Undershore, then use the secret path located after the save crystal, to find War-chief Supinelu waiting.
Molen can be found in the Hourglass Basin part. To get it to appear, the player needs to head into the secluded section of the area (the area with the Grenades and where the Catoblepas is fought), which can be reached via The Undershore by walking between the two "sandfalls", southeast of the save crystal. The player must wait roughly 10 to 15 seconds and they should see the Molen appear on the other side of the ravine.
To find the Alteci the player must have spoken to the "Huntmaster" in Phon Coast and defeated Thalassinon, which will trigger the start of the Rare Game quest. The player must build a chain of twelve Mallicants (or Shambling Corpses from Athroza Quicksands) in The Undershore area. Players do not need to leave and reenter to trigger the Alteci's appearance: one must simply scroll his spawnpoint off the minimap. The player should do this by going near an exit and then heading back towards the center of the room.
To make the spawning easier, the player can start the Mallicant chain in another area, as long as the twelfth perishes in The Undershore. The next area, Halls of Ardent Darkness, has many Mallicants—if the player kills eleven Mallicants here, moves into The Undershore and kills another, this will satisfy the requirements for the Alteci to spawn.