Stoneskin II (ストンスキン II, Sutonsukin II?) appeared as an ability in the original, as a spell that could be learned by Conjurers at rank 42. The ability bestowed the Stoneskin II status to all allies within the area of effect.
After the release of patch 1.20, Stoneskin II was removed from the game and Stoneskin remained a Conjurer spell.
Stoneskin II is a Conjurer spell available at level 50. When used, the spell will bestow the Stoneskin status to all party members within an area of effect, however the spell can only be used outside of combat. The ability has a cast time 6 seconds and has a cooldown time of 2.5 seconds. Unlike Stoneskin, Stoneskin II is not a cross ability and can only be used by Conjurers and Whites Mages.
Stoneskin II was added in response to play feedback about having to recast Stoneskin on each party individually after falling in battles. It was added in patch 2.45.
FFRK Stoneskin II is one of Y'shtola's unique Soul Breaks tied to the staff Thyrus (XIV) which at the expense of one Soul Gauge segment temporarily raises Defense and Resistance of all allies by 200%. If Y'shtola completes battles alive with Thyrus (XIV) equipped, she can eventually master Stoneskin II without needing to be equipped with the weapon in question to use it.