It is a level 5 potion spell, but still easily dispelled. Isaac's having a counter is essential. All other spells have some other way to reduce damage/counter them. Even if that is stoneskin, clarity, or endure elements.
Your 20% magic damage reduction would not work as the magic damage is tied to the death system. Bleeding, and rest damage, are both tied to this damage type. If you did not take magic damage you could never die from bleeding and you could also abuse the rest system.
Your 20% magic damage reduction would not work as the magic damage is tied to the death system. Bleeding, and rest damage, are both tied to this damage type. If you did not take magic damage you could never die from bleeding and you could also abuse the rest system.