The Seeker is a modded hostile mob that appears in most Overworld biomes during the night. It has a slow turn rate, follows the player. Its trajectory is changed when hit with a weapon that causes knockback. It is slower than phantoms. They drop lens which can be crafted into glasses, goggles, or sunglasses.
Various Seekers
It is directly inspired by the Demon Eye from Terraria.
The player can find a seeker temple in the Nether, in some chests you can find the Glimpse Shrine. During nights, the player can place the glimpse shrine and place a Redstone torch on top of it, and 4 lenses on the side, it will summon the Glimpse, which has the same health as the wither. The glimpse will shoot laser beams at you and you can attack it, but it's best to use ranged weapons.
The Glimpse Boss