Homebrew Rule: Fragile Soul

Your soul is fragile and the trauma of being killed makes it harder to re-attach to your mortal body. This is represented by your Soul Fragility (SF). Each character is born with a SF of 1d4+18.

How it works:

When attempting any resurrection spell, the caster must make a spell attack against your SF.

On a Success:

 * Components are consumed.
 * Your SF increases by 1.
 * You are resurrected as per the spell.

On a Failure:

 * Components are consumed.
 * Your SF increases by 1.
 * You are not resurrected, but the caster may try again immediately (assuming the spell allows, and you have the components).

Crit Success:

 * The caster has a moment of clarity and luck and is able to reattach your soul better than it was before.
 * Components are consumed.
 * Your SF decreases by 1.
 * You are resurrected.

Crit Fail:

 * Ouch, that even hurt the dead guy!
 * Components are consumed
 * Your SF increases by 2
 * You are not resurrected.

Notes: Assuming that resurrection spells become common around level 13, a Cleric should be able to revive someone 3-4 times before it becomes completely impossible. Those 3-4 resurrections will require 10 attempts total (and 10x components)