k, i've got one. it's called the temple of the harbinger. it was a temple that was dedicated to a beloved bounty hunter in ancient hyrule, who brought peace by killing evil people (like link but more rugged). the thing is, though. no one's been in (our out) of it for hundreds and hundreds of years. so link goes in and is greeted by a dark unforgiving room. when we finds a torch and lights it, he sees that the walls are dark granite, the floors are rough stone. he also sees a giant obsidian sculpture of the bounty hunter that just looks unnerving. he comes to find out that the temple is haunted by the bounty hunter and those he killed. it has difficult, elaborate puzzles that, if you mess up badly on, send you to another room and you have to go back, but evade the wailing ghosts, or they will steal your soul. the boss would be the obsidian statue that gets possessed by his ghost (which tingle frees, cuz he accidently follows you in, and then the spirit kills him). The outside looks dark, depressing, with black and purple stained glass windows, and a pointy gothic structure. you get the cape of phantoms for beating the boss. when you equip it, as long as you don't bump into anyone, you are temporarily a ghost.

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I need a fix cause I'm goin' down...