In what order do the effects from Steelskin, Frost Shield, and Jinxed Juju occur? If there isn't an order of operations, how does the game deal with situations where the damage taken from sources that aren't your life is above 100%? i.e. if a character had "Mind Over Matter", "Molten Shell" and "The Jinxed Juju", bringing the total damage from hits taken from other sources than life to 115%.
Jinxed Juju ("from your Spectres' Life before you") gets in first, changing which object the damage takes from in the first place - note the lack of any reference to Life or ES specifically, as this is before any consideration of what resource is lost to damage, only determining which objects the damage affects.
Frost Shield ("from Frost Shield before your Life or Energy Shield") is next, being more specific in that the damage is affecting specifically your life or ES, but still taking precedence over any buffs on you because this is taking from an external object, rather than a separate resource you have.
At this point all the damage that's left is taking something from you, rather than other objects, and further modifiers just change which resources are taken from.
Aegises ("from the Buff before your Life or Energy Shield") go next, having priority over Guard skills because they are an absolute effect which affects all damage (of the appropriate types) rather than a percentage of it - they don't have a percentage value that could be summed with a guard skill in any way, they just take all of it. You can't have multiple Aegises that affect the same damage (or at all), so there are no conflicts here.
Then there are the Guard skills ("from the Buff before your Life or Energy Shield"), which are like the aegises but only for a percentage of the damage. In theory if you have multiple guard skills active at once, they should apply additively with each other, but this is not possible, so the game doesn't actually handle that case.
At this point, all the "extra" resources are done with and all the damage that's left is taking from your life, mana or energy shield, specifically, and further modifiers only change which of these three is taken from.
Your Energy Shield steps up first, but chaos damage bypasses it.
After ES, Mind over Matter and similar effects ("before your life") have a final chance to jump in after ES but before life to siphon off some of the loss.
Then what remains is taken from life, although Petrified Blood can prevent some of the loss of life.
If there's still any excess damage that hasn't taken something away, it isn't your problem at this point on account of you being dead, because that means you ran out of life before you ran out of damage.