Getting down to a bit of work on expanding the elementalist class presented in Theorems & Thaumaturgy.
I'm going for a bit of a Gandalf vibe with some of these spells.
Sound the Deeps
Elements: Water & Earth
The elementalist invokes a dolorous boom to echo through a body of water or rock which he touches with his hand or staff. The returning tremors of the sound allow the caster to precisely divine the depth to which it travelled. Thus, the caster can determine the extent and approximate shape of bodies of water, chasms, shafts, clefts, mountain peaks, caverns, passages, and so forth.
In addition to this divinatory function, a sound the deeps spell may optionally be used to arouse slumbering beings in the affected area up to 50' distant per level of the caster. Creatures in a natural state of sleep are awakened to alertness and unnatural entities such as dormant undead, constructs, or planar beings may also be aroused.
Casting this spell always incurs a wandering monster check, as nearby creatures may come to investigate the source of the booming.