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FortificationItem 12+

Legacy Content

Abjuration Magical 
Source Core Rulebook pg. 582 4.0
Usage etched onto medium or heavy armor; Bulk
A fortification rune wards against the most deadly attacks. Each time you’re critically hit while wearing the etched armor, attempt a DC 17 flat check. On a success, it becomes a normal hit. This property thickens the armor, increasing its Bulk by 1 and the Strength required to reduce its penalties by 2.

PFS StandardFortificationItem 12

Source Core Rulebook pg. 582 4.0
Price 2,000 gp

PFS StandardFortification (Greater)Item 18

Source Core Rulebook pg. 582 4.0
Price 24,000 gp
The flat check DC is 14.