im not sure i know what ur talking about
ff10
or ff10-2

EDIT: Never mind i know

Boss: Guardian Beast
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This big fella can be pretty tough so make sure you have one person on the healing job either using potions or the much easier way, using cure from the white mage dresssphere. This big guy just needs a lot of solid whacks and not a lot of fancy magic attacks. The damage that they do to him isn't worth the extra wait time, so just use regular attacks on him. When he starts getting close to death he will use an attack called the Damocles Photon which will just about knock each characters life in half. Make sure they get healed back up quickly and continue to pound on him. He may use it again depending on how long it takes you to defeat him but he will eventually fall. For your troubles you receive a fragmented sphere and an amulet.