Mama Gurdy

Mama Gurdy is a boss that can appear:
 * In all environments of Chapter 4.
 * Only in and the.

Behavior
Mama Gurdy resides inside the wall at the top of the room. She has four attacks:
 * Creates temporary spikes in the boss room in random locations.
 * These spikes can spawn under Isaac but have a small delay before they can deal damage.
 * Spews a volley of large orange projectiles towards the bottom of the room, leaving slowing Orange Creep.
 * Shoots 3, 4, or 7 waves of 5 spread projectiles at Isaac's location.
 * Shoots a burst of disorganized projectiles at Isaac.
 * Occasionally retreats upwards off-screen before executing her spike attack. Performs her orange projectile attack immediately upon re-entering the screen.

Trivia

 * Mama Gurdy's name is a direct reference to a fan animation of the same name.
 * Mama Gurdy appears to be the final stage of the "Gurdy" boss line, with the first stage as Gurglings, second as Gurdy Jr., and third as Gurdy.
 * Mama Gurdy is the only boss with boss art that doesn't directly display them, showing only a hand.
 * She is also one of the only bosses not appearing as a degraded boss.

Mama Gurdy