YuugenMagan

Not much is known about YuugenMagan, a boss villain from Touhou, except that it is found near the gates of Makai in the first ever game, Highly Responsive to Prayers. Reimu encounters this multi-eyed monster near Makai's gates.

Appearance
YuugenMagan is a hovering set of five independently-moving eyes, connected by electricity and surrounded by strange markings.

Trivia

 * YuugenMagan's name means 'Deep Magic Eye'.
 * If you look at the center, you can almost see a character in a kimono in the area where YuugenMagan's "energy" meets.
 * The kanji for the name of one of Yukari's spell cards in Touhou Hisoutensouku (Demon's Eye "Laplace's Demon") is nearly identical to this character's name (compare 魔眼「ラプラスの魔」 of Yukari's spellcard to 幽玄魔眼(ゆうげんまがん), note the two characters before the parenthesis/bracket in both). Furthermore, it is an attack that summons multiple floating phantasmal eyes to attack the enemy, making it possible that this is a reference of some sort to YuugenMagan.
 * YuugenMagan's stage boss has the most hit boxes in the series that affects the same health bar, coming second would be the Prismriver Sisters in Perfect Cherry Blossom.