We are sending you to a set of caves, deep in america, i think this cavern system was part of a location used for human military testing. there is a hollow who seems to prey on random people passing by there, he is codenamed acid-blind.
all we know about him is he can somehow effect your senses causing blindness, we presume this is through some toxin, since somehting is secreted form his hands which has corrosive effects.
you are to go with a partner, this hollow is relatively dangerous.