Improved Knowledge of Magic

You learn how to cast a spell of 6th level or below from another spellcaster class.

Prerequisite: Cleric level 15, Knowledge Domain.

Benefit: You learn one spell of your choice from any class. The spell you choose must be of 6th level or below, or a cantrip. The chosen spell counts as a cleric spell for you but does not count against the number of your cleric spells known.