I would like the place to have a backstory too. Maybe its a tomb for the damned. Like people would be falsly accused of stuff and be sent down into the tomb to be killed by Death Hand or something.

I have in mind a woman with a baby being escorted down into the tomb by two men in robes that cover their face and they lead her down into the tomb and they ride a boat across a river and they send her into the boss room...then she looks up and sees the boss and dies as she screams. At first she is screaming and trying to escape the men's grasp as she is being led down into the tomb but she stops and just silently cries and moans.

Possibly have it a twist and make it Zelda that dies.