From Pathfinder Howl of the Wild, which isn't enabled.

Hidebound

SPELL 2

CONCENTRATE MANIPULATE

Traditions arcane, primal

Cast

Requirements A creature within range is hit with a Strike that deals physical damage.

Range 60 feet

Targets 1 creature

Duration 1 round

Trigger A creature within range is hit with a Strike that deals physical damage.

The target's skin erupts in thick hide or dense scales. It gains resistance 5 to physical damage, except adamantine, until the beginning of its next turn.

Spell Effect: Hidebound

Heightened (+2) The resistance increases by 3.

Pathfinder Howl of the WildORC