Okay, it does seem to be exactly what it says on the tin, but it only works a handful of times and then wears off
If I were you, I'd use in places with Fewmi, and avoid in places with the power ranger wannabe or (ironically) Lorenzo. If in a place with both, take into consideration your hunger, curses, health, and spacing skills. If you are healthy and don't want to waste time with fires, take the mask. If you think you have to use Mask or Lorenzo's attacks to I-Frame through ghosts, don't use the mask.