"Don't be stupid. Goblins don't exist. You don't even know what one looks like."
With Styx: Master of Shadows being a stealth game in which you play as a goblin -- the first of all goblins, at that -- yeah, I suppose the guy who said that will die thinking they aren't real. Actually, screw the silent approach -- I'd just as soon show myself before taking him down.
This Styx is the same Styx from Cyanide's prior game, an action-RPG called Of Orcs and Men, which some of you played and liked a fair amount. Master of Shadows is a prequel out this September for PC, Xbox One, and PlayStation 4. Seems to be all right.