The Schwarzgheist is based on the SS-01 SchwarzGheist from Einhänder. Schwarzgeist, meaning "black ghost" in German, was the stage 6 boss of the game. If beaten in a certain way it would send out the Monitor, something which it also does in its appearance in Kingdom Hearts III. Its attack patterns in Kingdom Hearts III, most notably its laser attack, are all derived from its appearance in Einhänder.
It has a unique battle theme among Gummi bosses; an arrangement of Thermosphere, the theme played while fighting it in Einhänder. When fighting the Schwarzgeist with the Endymion Special Blueprint, the original version of Thermosphere will play instead. Regardless of the ship used, the original version of Monitor's battle theme, Afterimage, will be played while fighting it.
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