SRD:Great Invulnerability (Epic Armor Enhancement)

Great Invulnerability
This suit of armor or shield grants the wearer damage reduction. The damage reduction can be 10/magic, 15/magic, 5/epic, or 10/epic, depending on the armor.

Caster Level: 19th (10/magic), 20th (15/magic), 21st (5/epic), 22nd (10/epic); Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, stoneskin, wish, or miracle; Market Price: +4 bonus (10/magic), +5 bonus (15/magic), +6 bonus (5/epic), +7 bonus (10/epic).