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There is a Legacy version here.

FortificationItem 12+

Magical 
Source GM Core pg. 226
Usage etched onto medium or heavy armor; Bulk
A fortification rune wards against the deadliest 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 GM Core pg. 226
Price 2,000 gp

PFS StandardFortification (Greater)Item 18

Source GM Core pg. 226
Price 24,000 gp
The flat check DC is 14.