A dragon claw or chocobo's talon to a soft stomach will speed a man towards his congregation with Halone unless a remedy known as Mother's Mercy is ingested in time. The medicine swiftly coats the inside of the stomach with a thick mucus, allowing the blood to clot and the wound to close. Due to the value in curing such grave wounds, Mother's Mercy is a staple of every chirurgeon's field kit. A knowledgeable botanist should be able to procure large quantities of gentian, the main ingredient which allows for clotting—though they will need to brave the Chocobo Forest to do so, as the plant no longer grows in Coerthas.
Travel to the Dravanian forelands, equip a botanist's secondary tool, and commence harvesting.