Great Gideon

Great Gideon is a boss added in The Binding of Isaac: Repentance that can appear in  and.

Behavior
Great Gideon is always fought in a vertical double-size room and additionally has no health. Instead, Isaac must battle 6 waves of monsters to beat him, similar to Greed Mode waves. He uses the following attacks during these waves: After Isaac defeats all 6 waves of monsters, Great Gideon will deactivate, similar to a regular Grimace.
 * Creates a vacuum that affects the whole room, pulling in Isaac and all monsters and monster projectiles. It also pulls in additional rock projectiles.
 * Spits 5 projectiles in a cone shape towards Isaac. The center projectile is larger and splits into 8 projectiles in a radial burst when it lands or hits something.
 * Charges up then spits large flame projectiles down the center of the arena that can occasionally leave small fires behind.
 * Some enemies caught in this attack are turned into their flaming versions: Rock Spider into Coal Spider, Clotty into Grilled Clotty and Gyro into Grilled Gyro.
 * After the beginning of the 4th wave, Great Gideon charges up and releases a rock wave down the center of the room, breaking parts of the floor and leaving gaps.
 * There is always at least 1 gap between the trail of holes created by this attack as to not completely trap Isaac on either end of the room.
 * Gideon does not spawn the next enemy wave during the middle of any of his attacks and only progresses a wave once he has finished

Trivia

 * He is the boss version of Stone Grimaces.
 * Great Gideon's name likely comes from Gideon, an Old Testament prophet and military leader known for winning a decisive battle against an overwhelming Midianite army with only an army of 300 Israelites.
 * The name Gideon is said to mean “hewer” which is an individual who works in a mine breaking stone.
 * Great Gideon is one of the only bosses with a unique health bar, aside from Dogma.
 * The crawl space that opens up when using Chaos Card on Gideon is titled 'Gideon's Grave' in the code.
 * According to NotYourSagittarius, this is a direct reference to Scott Pilgrim, a series of graphic novels.
 * If Great Gideon is fought using the debug console outside of or, he has preset waves consisting of Frowning Gapers, Wall Creeps, Round Worms, Gurgles, and Suckers.
 * Great Gideon is the only boss that can be seen in their boss room during the Ascent, appearing in his deactivated state when ascending to the.
 * Since all variant floors are replaced by the orginal ones in this sequence, if Great Gideon was encountered in the during the normal descent, he will still appear in the  during the Ascent.