Similar to, yet much more powerful than the early Pantheron enemies, the Adamantheron is rather fast and wolf-like. Its low stagger rate and relatively low HP make it a weak enemy, though in large numbers they can be annoying.
A useful general strategy when facing either large groups is to use the Delta Attack Paradigm, which allows the Commando and Ravager to build up the chain gauge while the Sentinel protects them. After staggering the enemy, it can be launched for an easy defeat.
Adamantheron appears as an enemey in the Eden and Orphan's Cradle classic dungeons in Final Fantasy Record Keeper, as well as some event dungeons.
Adamantite and similar words including Adamant and Adamantine are used to refer to any especially hard substance, whether composed of diamond, some other gemstone, or some type of metal.