Devil's Harvest/Mega Portal

Mega Portal is one of the bosses that can appear in Chapter 2.

Behavior

 * Mega Portal has a chance to summon a random boss with a quarter of their normal health, and becomes invincible whilst you fight them.
 * While invulnerable, Mega Portal fires projectiles in a circle periodically.
 * The bosses summoned by Mega Portal include Monstro, Dingle, Pin, Technopin, Rag Man and The Forsaken