Any combatant that reaches 0 hit points is Incapacitated and unable to act. They're dead if not stabilized within 1 minute (10 combat turns) or by the end of the fight (whichever is later).

An ally (PC or NPC) can attempt to stabilize an incapacitated character in several ways:

• Roll a Medicine Skill Check (or Intelligence Check if they don't have Medicine). If the character uses a Healer's Kit, the roll is made at Advantage. The character attempting Medicine/INT check must have some sort of bandage material or a needle and thread, or the attempt will be made at disadvantage.
• The following Divine Spells will stabilize an incapacitated character: Sustaining Touch, Heal Wound, Blessing of St'. Luke, Blessing of the Holy Spirit. Restoration, however, takes too long to cast to do any good.
• The Cleric archetype feature that heals all allies 1 hp within 100' also stabilizes incapacitated allies. As does the Templar/Hermit archetype feature Lay on Hands.
• A Blessed Healing Potion or Greater Blessed Healing potion (or a pint of Liver Squeezings wine) will stabilize an incapacitated character, but will only heal ½ normal hit points, because of the difficulty of drinking in an incapacitated state.
• A Poultice of Regeneration will stabilize an incapacitated character.
• The various roots and herbs are too slow acting to aid in stabilization.

When a character has been stabilized after reaching 0 hit points, he returns to 1 hit point (or more if the magic involved healed hit points). He still must roll on the Injury Table for an effect. If you apply a Poultice of Regeneration or if your Stabilization Check was a critical success, then the injury roll will be made at advantage.

A Medicine check (only one attempt allowed per day) will allow the injured character to ignore the penalty from ability score loss or Disadvantage to checks for eight hours. Character must have bandages and/or needle and thread or suffer Disadvantage to the check. If he uses a healer's kit, he gets advantage.

• A PC heals 1 hit point per level per night of Safe Rest.
• A PC heals 1 hit point per night of Unsafe Rest.
• Woundwart herb applied to wounds adds 1 additional point of healing per night.
• Herbal Healing salve forces 1 hour of rest/sleep, but heals 1D6 Hit Points.

There are manifold ways to heal hit points through magic and herbalism and the like.

• Divine Potions: Blessed Healing (1D8); Greater Blessed Healing (all HP)
• Divine Spells: Heal Wound (1D8); Restoration (all HP); Blessing of St. Luke (3D8); Blessing of the Holy Spirit (4D8)
• Zealot Archetype or Class Features: Zealot heal ally (1D6/level), heal all allies (1 HP), Lay on Hands (2hp/level)
• Special Drinks: Liver Squeezings (1D4, chance of blindness)
• Special Foods: Mighty Haggis (1D4); Awesome Pie (1D4) (either only once per day)
• Herbals: Healing Salve (1D6 1 dose at a time); Wound Wart (1 per day); Comfrey Root (1D4 once per day)
• Arcane Spells: Drink Life (1/2 of 3D6)

• Ability Scores heal 1 point per week of Safe Rest, or 1 point per 2 weeks of Unsafe Rest.
• Lost limbs do not return from rest.
• A successful dose of Black Lotus will restore 1D4 points of Intelligence damage.
• A successful dose of White Lotus will restore 1D4 points of Wisdom damage.
• The Restoration Divine Spell will heal all lost ability score points and restore all missing limbs.
• The Mold the Flesh Atlantean blasphemy can restore missing body parts.