Harden your Power Armor is an unmarked quest in Fallout.
- Fix hydroponic farms.
- Get power armor and chemistry journals.
- Return to Miles and receive the hardened power armor.
Once you have repaired the hydroponic farms in Adytum, Miles will offer to harden your power armor.
After finding one of these rare suits, return to Adytum, and Miles will send you to the Hub to retreive a set of chemistry journals. One way of doing this is to simply ask Mrs. Stapleton (who works in the library, Hub Downtown) for the books, and return to Adytum, where Miles will harden your armor.