Cyrodiil/Red Ruby Cave

Notes
Red Ruby Cave also appeared in Oblivion.
Just to west of the cave, across country, you will find an unmarked   with an   inside.
This cave contains 63 hanging moss plants, 20   plants, 9   plants, 4   plants and 1   plant.

Walkthrough
Exterior
Outside the cave you will find two   plants, two   plants, a  , one blue mountain flower plant and one   plant.

Red Ruby Cave
Immediately upon entering you will come across a skeleton corpse: loot it of the spell tome Sparks and continue down the mine shaft until you reach a small waterfall. Head up the winding tunnel, killing four   and looting a chest on the way. You will arrive on a wooden platform with a chest, a bedroll and a skeleton corpse, overlooking the previous waterfall. Pull the chain to lower the drawbridge below, track back and cross the bridge heading east, looting a potion of healing along the way. You will find yourself in a large room with a bear pit with two ebony ore veins. Head north, kill the   nearby and loot the blood-soaked skeleton and chest next to it. 

Follow the tunnel north past a few bear traps and you will find a small camp with a blood-soaked bedroll and table with a knapsack, a potion of plentiful healing, a potion of magicka, a   and an interrupted   detailing the attempts by a miner named   to find the cave's famous rubies. Continuing south along the tunnel you will indeed find a ruby geode and a few more rats, including one by a nest of hay hiding a dozen gold coins. Eventually you will surface on a ledge overlooking the bear pit, from where you can snipe down at the bear. Head south, past another bear, and pull the chain opening a secret stone door. Past this are a few more rats, a vampire, his thrall, a potion of plentiful stamina and the door to the Hollows.

After returning from Red Ruby Hollows, jump down the hole and you will find yourself in front of the waterfall at the start.

Red Ruby Hollows
Upon entering, fight past four rats until you reach a plank bridge over a waterfall-fed pool; inside the pool are three skeletons and a coin purse. Advance down the tunnels, dispatching two more rats and head west into a small room with a vampire, his thrall and a few coffins. Turn back and head north and you will arrive in a large room hosting a long table laden with silverware and with a throne at one end. Here you will find another vampire and three thralls along with an arcane enchanter, a barrel of uncommon ingredients, an  , a filled common soul gem and a copy of Opusculus Lamae Bal. Before taking the southeastern tunnel, quickly head northwest to a raised wooden platform where you will find a diamond and two rubies atop a bloodied altar, and a key-requiring gate.

Head southeast and you will arrive at a torture room with tools, cages and cells inhabited by a vampire and two thralls. In one of the cells you will find the body of  , the unlucky ruby miner. Press on to the sleeping quarters, where you will find a circlet of eminent illusion, two rubies, a gold ingot, a potent magicka poison, a fear poison and a weak paralysis poison. Follow the winding tunnel to the vampire master's chambers, where you will find a bed, a boss chest, a strongbox, the Alchemy skill book A Game at Dinner, a flawless ruby, a common ruby, two coin purses and the   opening the nearby gate, leading back to the main room. Head east instead for a quick exit back to Red Ruby Cave.

Maps