Delvers speak Terran and Undercommon.
Delvers prefer to fight from their tunnels, which they use to
protect their flanks while lashing out with their flippers.
Corrosive Slime (Ex): Delvers produce a mucuslike slime that
contains a highly corrosive substance. The slime is particularly
effective against stone. A delver's mere touch deals 2d6
points of damage to organic creatures or objects. Against
metallic creatures or objects, a delver's slime deals 4d8
points of damage, and against stony creatures (including earth
elementals) or objects it deals 8d10 points of damage. A slam
attack by a delver leaves a patch of slime that deals 2d6 points
of damage on contact and another 2d6 points of damage in each of
the next 2 rounds. A large quantity (at least a quart) of water
or weak acid, such as vinegar, washes off the slime. An
opponent's armor and clothing dissolve and become useless
immediately unless the wearer succeeds at a Reflex save (DC 22).
Weapons that strike a delver also dissolve immediately unless the
wielder succeeds at a Reflex save (DC 22). Creatures attacking
the delver with natural weapons take damage from the slime each
time their attacks hit unless they succeed at Reflex saves (DC
Tremorsense (Ex): A delver can automatically sense the
location of anything within 60 feet that is in contact with the
Stone Shape (Ex): A delver can alter its slime to temporarily
soften stone instead of dissolving it. Once every 10 minutes, a
delver can soften and shape up to 25 cubic feet of stone, as
stone shape cast by a 15th-level druid.