Cave Druid

Alternate progression for Druid, from Advanced Player's Guide.

Cavesense (Ex): A underground druid adds Knowledge (dungeoneering) rather than Knowledge (geography) as a class skill and gains a +2 bonus on Knowledge (dungeoneering) and Survival skill checks. This ability replaces the nature sense ability.
Nature Bond: A cave druid may select the Darkness domain in addition to the choices normally allowed, but may not select the Air or Weather domains.
Wild Empathy (Ex): A cave druid can inf luence oozes, rather than magical beasts, with a –4 penalty on her wild empathy check.
Tunnelrunner (Ex): At 2nd level, a cave druid can move through areas of rubble or narrow passages that require squeezing at her normal movement rate and without penalty. This ability replaces woodland stride.
Lightfoot (Ex): At 3rd level, a cave druid cannot be detected with tremorsense. This ability replaces trackless step.
Resist Subterranean Corruption (Ex): At 4th level, a cave druid gains a +2 bonus on saves against exceptional, supernatural, and spell-like abilities of oozes and aberrations. This ability replaces resist nature’s lure.
Wild Shape (Su): A cave druid gains this ability at 6th level, except that her effective druid level for this ability is equal to her druid level – 2. She cannot use wild shape to adopt a plant form. At 10th level, the cave druid can assume the form of a Small or Medium ooze as if using beast shape III, and at 12th level that of a Tiny or Large ooze as if using beast shape IV (treating the ooze as if it were a magical beast without a natural armor bonus). When in ooze form, the cave druid has no discernible anatomy and is immune to poison, sneak attacks, and critical hits.