abjuration earth 

Traditions arcane, primal

Cast [>>] somatic, verbal

Range touch; Targets 1 creature

Duration 20 minutes

The target's skin hardens like stone. It gains resistance 5 to physical damage, except adamantine. Each time the target is hit by a bludgeoning, piercing, or slashing attack, stoneskin's duration decreases by 1 minute.

Heightened (6th) The resistance increases to 10.

Heightened (8th) The resistance increases to 15.

Heightened (10th) The resistance increases to 20.

Core Rulebook, page 374.