There was a salt sting as Elthrir awoke and opened his eyes. Slamming them shut once more, he turned to his other senses. He was cold, oddly so, and his head rang. A thin chord dug neatly into his ankles and his feet couldn't feel the ground, but no other tether suspended him. Magic, perhaps? There was a noise just ahead of him, muffled and somehow wide sounding. Maybe he'd been hit in the head? That would explain the headache and muffled hearing, but not the cold and the odd feeling of levitation.
'It's far worse than you think, Elthrir' growled a voice from the same location as the noise he had just heard, and with equal distortion. 'Open your eyes, the pain will only last a few moments'.
Elthrir obeyed, and slowly lifted the lids of his eyes. The stranger knew who he was, although as the figure came into focus through the gloom of their location, Elthrir could not say the same for him. The captive dark elf looked around as his eyes adjusted to cope with the pain. The room, or cavern, they were in was expansive - the walls indecipherable from the gloom that descended upon them. The ceiling seemed as distant as the sky, and adopted a slightly paler blue than the walls. The floor consisted of a silty grey sand, and the Argonian - as the blurry figure had resolved to be - sat upon a large rock facing the elf. There was a slight breeze, and Elthrir bobbed to the left slightly in its wake, before returning to the spot he had originally been floating above.
Realisation overwhelmed the captive, and for a moment he flailed and panicked, attacking the rope around his legs - serving only to deepen the chord's bite and allow the stinging sea water more raw skin to attack.
'Don't flail; I'm not entirely certain what form the local wildlife takes, and we wouldn't want to attract them.'
Elthrir stopped moving, and panted through liquid filled lungs for a moment, before regarding his host. The Argonian was pale skinned; almost completely white but for a bluish tint to the larger scutes that adorned his body, and a crown of deep-blue feathers fluttered in the current.
'Let me explain. Four years ago, I was poisoned - an attempt on my life which, unluckily for you, was rather unsuccessful. Oh, don't worry about breathing,' he began, noticing Elthrir's attempts to hold his breath and fluttering chest, 'I poured enough water-breathing elixir down your throat when you were unconscious to allow you to live comfortably down here for a few hours, although you land-dwellers seem somewhat susceptible to pressure. Now, as I was saying: someone tried to kill me, they failed, and I'm trying to find them. That is why you are hear - you have answers.'
The Argonian pulled out a small, steel knife from its sheath.
'Now, this can work two ways. One; you help me, in which case I cut you free of your tethers and you're free to go on your way. Two; you don't help me, in which case I push you and the rock you're tied to into the trench behind you, and you suffer a rather painful death as thousands of tonnes of water crush you.'
Elthrir glanced behind him. Sure enough, the ocean bed descended into a black maw - the base of which lay far beyond the exposure of sunlight. A shudder of fear rocked the assassin's spine.
'Look okay, I don't know who tried to kill you, how would I? I've only been a member of the Brotherhood for a year'
'The Brotherhood?'
'The Dark Brotherhood: assassins. They probably had something to do with the attempt on your life, but I don't know. Hell, I don't even know your name! How am I meant to help?!'
'I don't know, Elthrir,' stated the Argonian coldly, before standing and walking across the ocean bed - held down by a set of iron weight around his ankles - toward the elf, 'Although if I were you'd I'd find a way' he finished, placing his foot on the rock that held the elf down.
'No! Don't! Look, the Brotherhood get the contracts from other people - they're mercs. I don't know which specific member tried to kill you, but they were just working for a contractor. If you let me go, I can return to the Brotherhood and look through the records to find who it was who put out the contract on your life? I can help!'
The Argonian pondered for a moment, before coming to a conclusion and looking at the knife in his hand. 'Okay, you're free to go,' he stated, before throwing the dagger into the chasm. 'If I were you, I'd cut myself free before the pressure becomes too much to bear.' he finished, before kicking the rock and it's elven cargo after the blade.
(Just to let you know, I don't want to join the Brotherhood - consider Lights-Up-Skylines a passive antagonist. He's looking for answers, and the Dark Brotherhood is in the way.)