Fargo's Mod/Wall of Flesh (Eternity Mode)

Eternity Mode Wall of Flesh is the final pre-hardmode. It is a more powerful version of the Wall of Flesh with more attacks and new behavior.

Behavior
Throughout the fight, only one of the Wall of Flesh's eyes can be vulnerable to damage. The vulnerability switches every 9 seconds.

Phase 1
The Wall of Flesh is a very large vertical boss. It will move across the underworld, forcing the player to move alongside it. It will fire high-velocity lasers from both of its eyes. The frequency and damage of these lasers will increase as the boss's health depletes. Every time its eyes are about to switch invincibility, it fires a deadly Divine Deathray from the eye that is about to go invincible.

Under 50% health, the Wall of Flesh enters phase 2.

Phase 2
The Wall of Flesh keeps its attacks from the previous phase and adds two new ones, based around the world evils, that it constantly alternates between. Corruption: It summons a wall of Cursed Flames from the other side that forces the player to get closer to the boss. The position that the Cursed Flame wall is going to disappear in is indicated by a vertical green line. Crimson: It fires many Golden Shower streams from its mouth that force the player to stay further from the boss.

Under 10% health, the Wall of Flesh enters phase 3.

Phase 3
The Wall of Flesh loses its purple eye laser attack, but it keeps all other attacks. Its eyes change invincibility every 4 seconds instead of every 9 seconds now. Consequently, it fires Divine Deathrays much faster. It also has much less cooldown between the world evil attacks.

Trivia

 * If the Eternity Mode Recolors option is turned on in the Mod Configurations menu, it resembles The Hallow.