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Ren basically had the Health Potions mastered.
He could now create small, medium, and large Health Potions even with barely acceptable equipment so long as he had the ingredients on hand.
The size of a health potion indicates the gravity of injuries and hurt it could restore. Small refers to minor injuries like cuts, bruises, lacerations, etc. Medium health potions treat deeper injuries, and large health potions cure serious to grievous injuries.
However, one must know that health potions cannot and never be able to guarantee survival by simply consuming some.
Sure, health potions are pretty cost effective and could be a live-saving consumable, but it's cannot guarantee everything.
Since potions are consumables, they needed to be digested for their effects to take place. And there is a limit to how much a person's body could handle all at once.
