This is a perk from the video game called; Dead by Daylight.

This perk is a Freddy Kruger / "The Nightmare" Teachable, able to be unlocked at level 40.

What Blood Warden does: Once per match, once the Exit Gates are opened, hooking a Survivor summons The Entity to block the exits for all Survivors for a limited time. While Blood Warden is active, auras of survivors located within the Exit areas are revealed to you.