Shield Runes
Etching one of these onto a shield is the only way to boost its Hardness and Hit Points, since shields sit outside the normal rune system.
Though shields can't be etched with weapon or armor runes, they can be improved by a specific type of fundamental rune known as a reinforcing rune. Reinforcing runes can be etched only on shields, including specific shields, and every reinforcing rune includes maximum Hardness and Hit Point values.
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