<!-- Google tag (gtag.js) --> <script async src="https://www.googletagmanager.com/gtag/js?id=G-G26W6267FY"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-G26W6267FY'); </script> **[Hub](Hub.md) / [Verum](Verum.md) / [Corvanis](Corvanis.md) / [Corvanis Classes](Corvanis%20Classes.md) / [Prestige Classes](Prestige%20Classes.md) / [Sentinel](Corvanis/Character%20Creation/Feats/Sentinel.md)** # Stoneskin As a [Reaction (C)](Reaction%20(C).md), when you are attacked, you may expend a spell slot to grant your skin the hardened property of stone. If you do, you grant natural [Armor Rating](Armor%20Rating.md) equal to twice the spell level expended. This lasts for 1 round.