A planar sneak finds creative ways to defy conventional limitations when trying to overcome extraplanar obstacles.
At 3rd level, a planar sneak gains a +1 bonus on saving throws against all effects with the air, chaos, earth, evil, fire, good, law, or water descriptors.
This bonus increases by 1 for every 3 rogue levels thereafter (to a maximum of +6 at 18th level).
This ability replaces trap sense.
At 4th level, a planar sneak treats creatures with the elemental subtype as though they were vulnerable to her sneak attack, but she deals only half as much sneak attack damage as she normally would. She can confirm critical hits against such creatures, though 50% of the time, the critical hit is automatically negated and damage is instead rolled normally. At 8th level, this ability also applies to all outsiders otherwise immune to critical hits and sneak attack damage.