Phantasmal Deathray

For more elaborate strategies on defeating the Moon Lord and learning about his abilities, including Weapon and Arena recommendations, see Guide:Moon Lord strategies.

The Phantasmal Deathray is a laser beam that is fired by Terraria's final boss, the Moon Lord. The True Eyes of Cthulhu fire a miniature version whose reach is much shorter and whose damage is much fewer. The Deathray deals 150 / damage, which can easily cripple the player.

The Deathray emerges from the central eye of the Moon Lord as a thick line that reaches beyond the edges of the targeted player's screen, and will sweep the area, covering most of the screen in its path. The only ways to possibly avoid the deathray is to be close to the Moon Lord's head and move around the central eye as it fires the ray, or, since the ray doesn't go through blocks, to be behind solid blocks as it sweeps. The Mechanical Cart also travels fast enough that it can keep the Moon Lord just out of reach, along with its Deathray.

The Moon Lord uses this ability every time it opens the eye in his forehead, though it takes time to charge and fire the deathray and it also takes time to close its eye after he's done firing it.