helpful. To be clear it literally cannot be installed before you remove the perks. I thought I could install it and then remove the perks and then activate it, but you literally have to not install it first.
The perk says it slowly heals radiation damage. That's not reduction, it's recovering from it after receiving it. Example, combining Solar Powered with Ghoulish would heal your standard health when taking radiation damage, then heal from the radiation afterward.
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