Best Earth-Based Character Build

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I'm entering an underdark campaign and want to play some kind of earth-based character. I'm looking at sorcerers, druids, oracles, clerics, witches, etc. Anything that can be based on the element of Earth. What are some of the most interesting options?

[Syries]

Earth kineticists are pretty fun. They can Earth Glide with tremorsense then use Impale talent from beneath the ground to hit unsuspecting targets.

Druids can kind of do something similar by morphing into earth elementals. With a 1 to 4 level dip in Monk (with the Shaping Focus feat) you can flurry of blows (typically a better option than the natural attacks from the elemental) after 5ft stepping out of the ground or walls (assuming they're made of stone)

[Slyme]

I play an earth kineticist in PFS, and I really enjoy it. They start off kind of slow, but once you get to around level 7+ they get some nice versatility and power.

Takes a little bit to get used to the mechanics of the class, but they are quite good once you figure them out.

[Slyme]

If kineticist isn't your thing, pretty much any class as with Oread as your race, or Dwarf to a lesser extent.

Stonelord Paladin archetype (dwarf only RAW, though Oread fits very well, and some GMs will allow them as well) is very thematic.

Cave Druid archetype maybe, any Druid can work, they have a decent number of earth related spells.