Amulet of Omjag

This amulet has 10 charges and can be used as a shield by medium and large sized creatures. While using it, you can use an action to expend 1 or more of its charges to cast one of the following spells using one charge per spell level: Earthbind, Call Lightning, or Storm Sphere with a spellcasting modifier of 18. Damage done to dragons in this way ignores all resistances and immunities.

The spell is recharged completely any time a storm is overhead (not conjured by the amulet) or if the amulet receives the equivalent of 20 lightning damage. Otherwise, the amulet regains 1 charge per sunrise.

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.

Notes: Bonus: Armor Class, non-dragon paladin or cleric, Damage, Debuff