Mortiphasms are bosses from Final Fantasy X. They are the four discs that surround Seymour Omnis and are fought in addition to him.
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Battle[]
As a Mortiphasm disc rotates, a different colored section will face the side closest to Seymour Omnis; these determine which spells he will cast each turn, as well as his elemental affinity. The battle starts with the Fire side of all four Mortiphasms facing Seymour, making him cast four Firagas and have a weakness to Ice.
Physically attacking a Mortiphasm causes it to rotate to the left, and using magic causes it to rotate to the right. The Mortiphasms, unlike Seymour Omnis, are out of reach, so only Wakka, Valefor, Anima and Mindy can attack them physically (Mindy must use a regular attack, not Passado). Mortiphasms are immune to damage; if the game is modified to allow them to be defeated, they will disappear and become untargetable, though they will still rotate once and allow Seymour to cast four spells.
If there are one or two of the same colors facing Seymour, he casts a second-tier spell (Fira, Blizzara, Watera, Thundara). On his next turn after casting Ultima, the discs will rotate so that all four of the next ordered element are facing him.