So in our homebrew universe, we don't have resurrection (as we feel it cheapens character dead, etc, etc... don't really want to get into that debate). Spells like revivify, raise dead and resurrection simply aren't on anyone's spell lists. They don't exist.
But then Xanathar's Guide includes the Zealot, which has the class feature Warrior of the Gods, which is all about resurrection.
Warrior of the Gods. At 3rd level, your soul is marked for endless battle. If a spell, such as raise dead, has the sole effect of restoring you to life (but not undeath), the caster doesn’t need material components to cast the spell on you.
In a universe without resurrection, this class is now missing a key feature. I want to come up with something to replace it that is still balanced and has a similar flavour but that doesn't involve resurrection.
I've come up with this:
Warrior of the Gods. At 3rd level, your soul is marked for endless battle. If you drop to 0 hit points, you have advantage on death saving throws, and any creature that attacks you in melee whilst you are at 0 hit points must roll a natural 20 as their attack roll to score a critical hit against you, otherwise the melee attack is considered a normal hit and you only suffer one death saving throw failure.
My main question is this: is there any way that my proposed feature can be compared to the original feature to see if it is balanced?
If not, is there any way to improve my question so that it is possible, or otherwise on-topic for RPG.SE (since I imagine asking for suggestions for homebrew replacement rules is not)?