I can't see anything... Achievement in Vampire Survivors

This relic is located in Moongolow, the second bonus stage. Refer to Boss Rash (5G) for unlocking all of the bonus stages.

This relic works much different than the others. You must play Moongolow as a non-secret character and reach the 14-minute mark in the stage. Any of the first few rows of characters will do, but my recommendation is Pugnala. Once you reach the 14-minute mark as a non-secret character, you'll be teleported to a new area, called the Holy Forbidden. It's basically a simple long hallway you need to follow to the end. You lose everything you had from the previous 14 minutes, and just have your basic starting weapon. Enemies don't drop anything along the way, so this is mainly a task of dodging enemies as you progress rather than trying to kill anything. This is another reason I recommended Pugnala, as she has good movement speed.

You have a couple minutes of walking along a winding corridor and dodging enemies to get to the end. Fortunately, if you die, you can select Holy Forbidden on the level select screen to try it again without having to do another 14 minutes in Moongolow. Once you get to the end, the enemies will disappear. Follow the path into the beam to be awarded the Yellow Sign, completing the level and unlocking this achievement.