Bahamut - A vengeful revenant of the fallen great wyrm Bahamut.

Ifrit - Personification of desert heat and fire itself. May have origins with Lahabrea.

Titan - A god of mineral wealth to the kobolds, hence all the digging and smelting and alchemy.

Garuda - A leader of the Iksalion and/or perhaps an Allagan official.

Leviathan - A sea monster regarded with fear by sailors and sahagin. May or may not be related to the myths of Thalaos and Perykos.

Ramuh - Thought to be the sylphs interpretation of Rhalgr.

Shiva - Based on Hresvelgr's soulmate, though this version has considerable influence of Halone.

Phoenix - An ancient symbol of rebirth, likely from before the Great Sundering.

Ravana - Some entity the Gnath Overmind conjured as an an anti-dragon weapon.

Bismarck - Based on a legendary whale, known to both Vanu Vanu and Roegadyn. Presumably was once a fey.

King Thordan - The old Ishgardian king as interpreted by the church's scripture.

Sephirot - A personification of the world tree, at least, according to the original inhabitants of Meracydia.

Sophia - A goddess of balance by the spoken peoples of ancient Meracydia.

Zurvan - A god of victory by the Reptoids of Meracydia.

Shinryu - The boundless rage and bottomless despair of Ilberd, appearing as a very crude simulacrum of Midgardsormr.

Sri Lakshmi - Patron goddess of Ananta, though the version we fight is the Qalyana's version for escapism.

Susano - A god of revels in the Far East that....just feels like doing things sometimes.

Tsukiyomi - A Far Eastern lunar kami, summoned as the form of Yotuyu's vengeance