This dull steel armor looks extremely well-made, but also quite simple. The more you get hit, the harder the armor gets.
|Lvl 3||+1||680 gp|| ||Lvl 18||+4||85,000 gp|
|Lvl 8||+2||3,400 gp|| ||Lvl 23||+5||425,000 gp|
|Lvl 13||+3||17,000 gp|| ||Lvl 28||+6||2,125,000 gp|
Armor: Chain, scale or plate
Enhancement Bonus: AC
Each time you reach a milestone in a day, the enhancement bonus of this armor increases by 1. This bonus resets to the armor’s normal enhancement bonus after an extended rest.
Published in Adventurer's Vault, page(s) 47.