Homebrew Rules

Powerful Potions (Credit to Ricky)

You can use an action to drink a potion and gain its full benefit without having to roll or you can use a Bonus Action to do it quickly at risk of spilling some (rolling like normal). You can also pour your potion into the mouth of a fallen creature as well, however this can only be done as an action, not a bonus action.

Critical Hits & Critical Fails

Crit Hits formula is (base max damage x2 + modifiers). Meaning if you rolled a critical hit with a melee attack that would normally do 1d8 + 4 you would instead deal 16 damage, then add your modifiers (+4).

Fails are left to fate. This means the DM will likely decide what happens. Nothing could happen, or you could accidentally loose an arrow into the arm of your comrade...only fate knows. Crit hits/fails affect players, NPCs, and monsters all the same.

Death, Resurrection, etc

Modified RAW. 3 Failed Deathsaves = permadeath. 3 Successes = brought back to 1 hp with 1 level of exhaustion. Until stabilized from some other means, an unconscious (near death) player will roll deathsaves. A nat 20 = 2 success and a Nat 1 = 2 fails. Any level of healing will bring a dying player/creature to at least 1 health. If the amount of healing were to exceed the negative number the player has based on the below calculations, the player is instead resurrected with the excess number of healing.

Resurrection is not common in Valecar. There are ways but they are far and few between. Death is viewed as permanent and should be feared as a mortal.

Massive Damage & Instant Death Calculations

If a creature or player were to receive DOUBLE their total max hitpoints (not including temp hitpoints), they are killed instantly. If an unconscious creature/player takes a total of Double their total max hit points, they are killed regardless of deathsave count. This means while unconscious and dying, a creature/player can still take damage.

Note: In most situations, monsters will not continue to deliberately attack an unconscious/dying player directly. However this does not mean splash, cleave, or other Area of Effect (AOE) damage cannot kill a dying player.