We had medicine in the medieval times right? So why not have surgeons? Here is my idea.
Surgeons are based on a new attribute intelligence. Every 3 points in the attribute allows you to upgrade a skill, there are 3 tiers of skills, it goes like this, if you have 2 point in first aid you can go to the next tier and then the next tier and so on and so forth.
First aid: Only helps minor wounds if you had 1/5 of your health gone you can be healed.
Wound Treatment: Treats mediocre wounds if you had 2/5 health gone you can be healed.
Surgery: Treats serious wounds if you had 4/5 health gone you can be healed.
Note: You can not heal yourself, only teammates can heal you.
Items:
First aid Kit: Must have on you for all healing if you don't have this you cant do any healing.
5 INT
Weight: 10
Can only be used twice
Cost: 7,000 gold
Surgeon scalpel: Used for surgery, IS NOT A REQUIREMENT you don't have to use it if you don't want to but if you don't you cant perform surgery.
18 INT
Weapon length: 45
Weight: 1
Speed rating: 110
Thrust damage: 23 Pierce
Swing damage: 23 pierce
Cost: 15,000
I got this idea from the mod Persistent world and NordInvasion
love those mods