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From Pathfinder Impossible Magic, which isn't enabled.

Trinity Geode (Greater)

ITEM 8
EARTHMAGICALSPELLHEART
Price 460 gp
Usage affixed to armor or a weapon
Bulk —

The crystal chamber within this split geode is divided into three lobes of equal size. The spell DC of any spell cast by Activating this item is 24.

  • Armor After you cast an earth spell by Activating the geode, you gain resistance 3 to physical damage (except adamantine) until the end of your next turn, or double the resistance for a non-cantrip spell.
  • Weapon After you cast an earth spell by Activating the geode, your Strikes with the weapon deal an additional 1d6 bludgeoning damage until the end of your next turn.

Effect: Trinity Geode - Armor

Effect: Trinity Geode - Weapon

Activate Cast a Spell
Effect You cast Scatter Scree.
Activate Cast a Spell
Frequency once per day
Effect You cast One with Stone.
Pathfinder Impossible MagicORC