From Spell Research introduced in Ancient Powers.

Inscription of Impenetrability
Value: 60,000
30 Burden Units
Inscribed Spell: Incantation of Impenetrability

Improves a shield of piece of armor's armor value by 240 points. Target yourself to cast this spell on all of your equipped armor.

Use this item to attempt to learn its spell.
Casts the following spells: Incantation of Impenetrability

Spell Descriptions:

Improves a shield of piece of armor's armor value by 240 points. Target yourself to cast this spell on all of your equipped armor.)

Notes