Its been a long time since I've made a suggestion here, so I thought I would finally make another one. This one, as you can tell by the title is about Karn, that one planet the Doctor visits in the classic story "the Brain of Morbius" and on several other occasions, including his regeneration from his 8th incarnation to his War one. So lets get right into my suggestion on how to implement Karn.

KARN (New Dimension):

Karn is a rocky planet. Not really hilly, but with tons of weird rock formations, which makes trying to land on the planet in a convention spaceship quite difficult. It does have a few maintains, but is not entirely mountainous. It, like Skaro, is also mostly a red-brown colour. The landscape of Karn from what I've just described doesn't sound so interesting for a new dimension does it? Well, luckily, Karn is the home for many crashed spaceships. Perhaps crashed by the Sisterhood (who I'll get on too soon) or perhaps brought down by something else. Whatever is behind the crashings doesn't matter, all that does is there are lots of crash space ships. The crashed spaceships would generate all over Karn, most being worthless, but with the occasional few being made of a valuable substance or containing a chest with some valuable loot inside (spacesuits, guns, diamonds, etc). Alongside these wrecks, the Player will find the occasional Asylum Dalek or damaged Cyberman (only 1 of the two within every 3x3 chunk area). Karn would also contain a few, even rarer locations, which would exist somewhere within a 1000 blocks from 0,0. These locations would be Solons castle and the Sisterhoods hideout. Both of these locations are important later. 

Some images of Karn Geography I found on google:

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Rocks

A maintain near a lake

The Sisterhood of Karn:

The Sisterhood of Karn, for anyone who hasn't seen Night of the Doctor (though it is free), is a Sisterhood which worships a flame from which flows the Elixir of life. You know, the stuff that trigger the 8th Doctor's regeneration and which is suggested every 5 seconds. Yeah, that stuff. Because they constantly drink the Elixir, the Sisterhood never age, although if they do not drink, they will soon age and die (perhaps this could be a mechanic?). The Sisterhood would not be hostile to the Player unless the Player comes with in a certain distance of the Sacred flame which is in their hideout hidden in a maintain. If the Player does come to close however, the Sisterhood will attack with sticks of fire (which deal 4 attack damage and set the Player on fire), attacking until the Player (or whatever hostile nasty) is out of attack range and away from their hideout. They would then return to their original state of not caring about the Player, unless attacked by the Player. If attacked, the Sisterhood will move the Player's TARDIS to their hideout, preventing its resummon and also send members out to hunt for the Player. If the Player is not a Timelord, the Sisterhood will use their mental powers to give the Player negative potion effects such as Nausea, Bad luck, low levels of Mining fatigue, blindness and weakness. You can get rid of these effects by either finding a way to leave Karn or killing all the Sisterhood, of whom there are only about 2 dozen in the entire world (though 1 or 2 more will spawn if there is atleast 1 member alive and no players are rendering the hideout). 

Images:

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The Sisterhood and their Leader, Ohila [pictured front]

Lair of the Sisterhood. 

The Scared flame and the Elixir of life:

If you murder the Sisterhood or do something else*, you will get access to the flame. The flame, when right clicked with an empty chalice, will fill the chalice with the Elixir of life. This Elixir will remove any negative potion effect (unlike milk, which takes away all effects, even if positive) and give you Regeneration 2 for 3 minutes. If you are beginning to Regenerate, immediately drinking the Elixir will allow you to chose your form and remove any negative effects that Post-Regeneration might cause. 

Scared flame image:

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Morbius:

If you head over to Solons Castle (which I sadly can't find any exterior images of), you will find not only a few not very valuable loot chests, but also the lifeless body of Morbius himself. If you activate power to his body somehow, Morbius will come to life and attack you. Morbius has high defence, the equalivant of iron armour and a ton of health. He can throw you backwards, and deals 9 attack damage. He is also immune to arrows (lasers still work though) and has speed 1. You need to go into this fight prepared, if you don't, you will die. If you kill Morbius, the Sisterhood of Karn will become peaceful towards you (unless you attack them), meaning you can get some of that sweet, sweet Elixir. Morbius also would drop a ton of credits, some Zeiton 4 and also his brain, meaning if you get some more body parts and make a brain case, you can resummon Morbius, allowing Multiple players on a Server to fight Morbius. Note: Morbius can only be resummoned in Solons Castle, as that is the only place special equipment is. 

Images of Morbius:

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So that is my Karn suggestion. Feel free to suggest things for this suggestion.