From Battle of the Immortals Wiki
Oracle items are the most powerful type of accessory in the game. There are 3 levels of Oracle item; one for level 85, another for 100, and another for 115. The level 100 items are upgraded from level 85 items, and the level 115 items are upgraded from double the amount of 85 items.
The three different levels of Oracle item stack for the purposes of Set Bonus. For example, if you have one Level 100 Oracle item and one Level 85 oracle item, you get the same bonus as if you had two Level 85 Oracle items.
These items are very scarce, with only a few pieces given out each week. Usually the top guilds control the means of accessing them and distribute them on a merit basis.
Types and Obtaining
The reward for reaching SS rank in Pyramid Hallucination is a Life Pendant (simply called Oracle Charm in International BOI) for a random class. Note: As of the Guardians of Fate Update, SS Rank in Pyramid Hallucination no longer gives a Life Pendant.
The Oracle ring is called Planet Ring (for physical attackers) or Sky Fingerband (for magic attackers). (These are simply called Oracle Ring and Oracle Fingerband in International BOI).
Ashura King Tanno may drop a Fragment of Oracle Set Ring. Bosses in the Pyramid event may also drop a Fragment of Oracle Set Ring. 5 Fragments of Oracle Set Ring can be traded from Skuld in the Guild Manor for a ring of your choosing.
After defeating Osiris in the Pyramid event, the two players to trap Osiris receive an Oracle Ring Box, which can be exchanged for a random Oracle ring.
A Planet Ring or Sky Fingerband can be upgraded to a Holy Ring using 5 Poseidon's Forces, which can be obtained from Poseidon's Temple. A Holy Ring can be upgraded into an Eloquent Ring using 10 Poseidon's Forces.
The Oracle amulet is called Death Necklace (Oracle Necklace in International BOI).
Ashura King Tanno may drop a Fragment of Oracle Set Necklace. Bosses in the Pyramid event may also drop a Fragment of Oracle Set Necklace. 5 Fragments of Oracle Set Necklace can be traded to Urd in Guild Manor for a necklace of your choosing.
Osiris Treasure Maps can be used in the Pyramid event. There is a very small chance to get a Death Necklace when using the maps.
A Death Necklace can be upgraded to a Holy Amulet using 10 Glacier Souls, which can be obtained from the Fort Glacier War. A Holy Necklace can be upgraded into an Eloquent Necklace using 20 Glacier Souls.
Oracle items can be upgraded at Leon by providing the correct materials. The process will reset the fortification level of the item to zero, but leaves all other attributes alone. The Upgrade Charm can be used to preserve fortification level.