From some online RP, I had cause to develop and expand on a new Aeon, based in the Final Fantasy X world. Named Yuurei, after a Japanese ghost of vengeance, he's elemental to 'death' and 'poison', much like the existing espers Hades and Doomtrain.
This is his Key Glyph, which one would see after successfully completing his Cloister of Trials.... a task that unlike any other Aeon, more often than not proves fatal if failed.
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.. I love it. ^.^ *squeal*