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Message: <blockquote data-quote="jgsugden" data-source="post: 9136700" data-attributes="member: 2629">My Underdark is a bit different.  There are two different situations - one constantly dimly lit and the other periodically lit, but mostly unlit.When you go down from the surface of my world and enter the Underdark there is a roughly 50 mile deep layer that is riddled with passages, caves and chambers.  It can take weeks to 'hike' down to the 'bottom' of this layer, or it can take 25 minutes to "skydive" where there have been straight chute tunnels made.At the bottom of this layer gravity flips.  As in Spelljammer, there is a flat (really a huge sphere) line where two gravity forces come together and effectively create zero gravity (although you can toss a stone and watch it alternate between gravity fields) - but much of this area is massively flooded to a depth of several miles.  Once you 'flip' over you will find yourself in another world of passages, caves and chambers that requires another 50 mile climb up towards the center of the world ... before you reach the Underdark Surface.The Underdark Surface is a Dyson Sphere like setting surrounding a purple 'star' that emits dim purple light.  Essentially, it is perpetually like it is 20 minutes after sunset and you're wearing purple lensed sunglasses in the Underdark surface.  That world is truly massive, but has very limited plantlife and ground based water - resulting in much of it being inhabitable only to things that do not need to eat or drink.  There are, however, some settlements in oases where there is a water source, and some creatures have been able to adapt to pulling their water from the air (as it is a cold and humid wasteland).The passages, chambers and tunnels are speckled with naturally occuring bio luminescence, magical lighting, and other sources of natural light (lava streaks, etc...) - and unnatrual light (fire elementals).  There are many civilizations in the larger chambers - and whether their massive chambers are lit or not is a matter of survival strategy, generally.The most common non-teleportation travel into the Underdark surface in my world is to fall the 50 miles to the 'bottom', then use flight magic to climb up the 50 miles to the Underdark Surface.  There are also a few 'Elevators' that can take you all the way, although they are hard to maintain.  These areas tend to be extremely well lit to aid in their maintanence and defense.</blockquote>

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