Dustsoul Feat 1
Source Pathfinder Lost Omens: Ancestry Guide
Your earth elemental ancestor's influence manifests in you as dust and dirt, like the soil of a field or the hot desert sands. You gain the trained proficiency rank in Survival. If you would automatically become trained in Survival (from your background or class, for example), you instead become trained in a skill of your choice. You can sustain yourself on dirt and ash instead of normal food and water.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
OreadA type of geniekin descended from a being from the Plane of Earth.