Wouldn't it be kinda OP, so much sapling you can use for bioreactor.

one could use bioreactors, but please keep in mind that cutting a tree down with molten gives charchol which does in the coal gen for much MORE power that the leaves

Stahart, all they would need to do is just lower the power output of saplings. I am just trying to give potency more use, so it adds more value to the rune.

Potency could have so many different uses tbh. It has the potential to be a wildcard rune with many interesting interactions. I personally enjoy seeing any balanced idea such as this for Potency uses, and I support it :)