Coznix, the Fallen Beholder

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Coznix, The Fallen Beholder is a boss added in Terraria's Thorium Mod. It is intended to be fought before the Mechanical Bosses, but can be fought at any point once the Wall of Flesh has been defeated.

Kill Count

Cake, Leaf (Terraria Thorium Inro HC #1)

Survivors

Summoning

In order to summon Coznix, you need to use a Void Lens in the Underworld. A Void Lens can be crafted at a Hellforge using 4 Souls of Light, 10 Glass, and 4 Souls of Night

Attacks

The Fallen Beholder will fly in the air and occasionally lunge at the player, dealing high contact damage. It will occasionally summon 'Enemy Beholders' when above 35% health. As Coznix does this, it will barrage the player with a variety of magical attacks. As it does this, it will:

Shoot out a slow moving, but powerful, eradication beam at the chosen player.
While below 80% life, will unleash a large spread pulse of dark magic that heavily debuffs players it contacts.
While below 60% life, will summon slowly moving void gates that shoot powerful laser beams directly beneath them.

Aftermath

When killed, Coznix's drops will spawn inside a box made out of Hellstone Bricks to keep them from falling into lava.
Defeating Coznix will cause either Lodestone Chunks or Valadium Chunks to generate throughout the world. This can happen up to three times per ore with each successive defeat, and more ore than usual will generate each time if defeated in Expert Mode.
Defeating Coznix for the first time will allow the Weapon Master to move in.
Once defeated, certain NPCs will start selling new items:
- The Cobbler will sell Lava Waders.
- The Confused Zombie will sell The Void Heart and Death Gazer's Glass.
- The Diverman will sell The Sea Mine.
- The Party Girl will sell the Kazoo.
- The Spiritualist will sell the Cross Necklace, Recuperate, Li'l Cherub's Wand, and Li'l Devil's Wand.