I enjoyed this idea very much and the attempt to try and give it more of an alchemy flavor with the use of some ideas from chemistry and accidental explosions in the labs. Having watched a number of such things on a smaller scale, I liked the parallel very much. There should be some cost not just to the user of this dangerous potion but in the development of it also. The bit about increased stamina was clever too. The elixir by helping provide more oxygen to be available could help lessen the buildup of lactic acid from the depletion of oxygen during anerobic activities like combat. Go to Comment
This was a lot of fun to read. It might be more fun with having a way out in addition to timing to keep the playes guessing and fighting at the same time. As a spin on the idea, perhaps it could be used to carry or transport a lot of people to safety or prison? Perhaps a village of refugees could be rescued and passed by border guards? A bandit or criminal, etc., could be tricked by one individual slight of size but mighty of brain and transported for the reward money. Go to Comment
When you sleep, your soul briefly returns to the place where it was created/goes to when it dies, and seeks nourishment. Everybody's soul is created with a little link (or you could say a greater entity calls it back) to that place so that it can return easily, but upon death, the soul returns via that and annihilates the link as if returns.
Also, as an added thingy, you could say the entity supplying the link, or residue of the links themselves, (whichever) is the source of all arcane power.