Aeon Stone (Polished Pebble)
A polished pebble aeon stone imbues you with the strength of the earth, granting a +1 item bonus to saves and DCs against attempts to grapple or swallow you.
The stone's resonant power allows you to cast Grease as a primal innate spell once per day. You can target only surfaces, not objects, with this spell.
Traits
Effects with the earth trait either manipulate or conjure earth. Those that manipulate earth have no effect in an area without earth. Creatures with this trait consist primarily of earth or have a connection to magical earth.
A character can invest only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
Something with the magical trait is imbued with magical energies not tied to a specific tradition of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.