Espada has Auto Regen. He counters physical attacks with Hades Claw, which causes Instant Death and Poison. There's a high chance it will use it three times in a row, making it possible for it to wipe out the entire party with no trouble. Espada has no resistance to Armor Break, and has only 50% resistance to Slow.
Espada drops weapons with Strength +% abilities and armor with Defense +% abilities, Strength +20% and Defense +20% being fixed abilities.
Like most Area Conquest monsters, Espada is quite easy if the player has the Celestial Weapons. Espada has an instant-death counterattack, so Deathproof armor is useful here. Otherwise, it is recommended to use armor with Auto-Haste and Auto-Phoenix, as they will cut down on the number of turns lost reviving downed members and re-casting Haste upon them, which will happen often due to its Blade Shower ability.
Espada and Neslug are the only arena creations immune to Doom. Coincidentally (or maybe intentionally), they are also the only two arena creations with a Zanmato level of 4; the others all have a Zanmato level of 5.