AtmosFX - Blood Walls

https://atmosfx.com/products/blood-walls

Not for the faint of heart, the Blood Walls Digital Decoration Collection transforms any environment into a bright red bloodbath. Project an oozing, dripping bloodbath onto your walls and watch in horror as messages written in blood materialize from nowhere. Perfect for Halloween parties and haunted houses, this frighteningly realistic collection of effects is sure to start even your bravest party guests screaming.