Quote Originally Posted by JeminiZero View Post
It might be easier if you use a bunch of everburning torches as your light source.

Once you have that, supporting the halfling may be actually be possible if you consider the following:
1) In a typical ecosystem, amount of oxygen generated is limited by the fact light comes from only one direction. So although a tree has many leaves, only the top few are most productive.
2) Light is only available half the time.

A tree in the BoH with multiple light sources from all over via many EB torches, will recieve much more net light than a typical tree in the forest. It also recieves a continuous supply of light 24 hours a day. I don't have any hard numbers, but a EB torch filled forest in a fair size BoH might be able to generate enough oxygen to support a Halfling.
Is a terrestial system the best option? I'd think it would be easier to balance an aquatic system.