Adamantoise

Notes:

 * Valley of Sorrows: Spawns every 21-24 hours; Aspidochelone is a lottery pop with Adamantoise. After Maintenance, HNM is reset to Day 3 pop cycle, therefore Aspidochelone has a chance to pop, albeit a very small chance, as with normal Day 3.
 * Has Draw In ability.
 * Adamantoise will rage after 30 minutes.
 * Usually taken down by groups of 6-12.
 * Can be duo'd / trio'd by Black Mage or Red Mage
 * Very high physical defense
 * Weak to elemental magic.
 * Nyzul Isle: Possible boss of the 20th and 40th floors. One random Nyzul weapon will always drop. Uses an enhanced version of Tortoise Song that dispels up to any 3 buffs from players (not just songs/rolls). Tortoise Stomp is a conal AoE, and can be dangerous if caught unaware.

Historical Background
Adamantoise has no mythological background and is a Final Fantasy-series creation, first appearing in Final Fantasy II (1988). Its name is fused from the words "adamant" + "tortoise". Adamant, though, derives from Medieval legend and has roots in Greek and Norse mythology. Adamant refers to any extremely hard mineral and in mythology was so strong, it could harm gods or bind gods. In Greek mythology, Cronos used an adamantine sickle to castrate his father, Ouranos (Uranus) and take power from him. The Greek pit, Tartarus was sealed with columns of adamant. In Norse mythology, Loki was shackled with adamantine chains. Late Medieval and Early Modern European writers used adamant as well. In Paradise Lost by John Milton (1667), Satan was bound by adamantine chains. In Gulliver's Travels by Jonathan Swift (1726), the floating island of Laputa was lined with adamant along its bottom. In The Faerie Queene by Edmund Spenser (1590; 1596), the golden sword Chrysaor, wielded by Sir Artegal, was tempered with adamant. Adamant is derived from the Greek word "adamas" meaning "untameable".

This turtle, by the name Adamantoise or Adamantaimai has appeared in Final Fantasy II, III, IV, V, VII, VIII, IX, X. In most, but not all cases it had very high defense (the exceptions: FFIII, IV). It has not always been the most important turtle in the games it appeared in, with the Land Turtle being a more important turtle in FFIII, and Gilgame (or Gil Turtle or Gilsnapper) being a special enemy in FFV.