The Lore check is a type of Skill check typically presented by encounter cards. It represents a test of the Investigator's arcane knowledge in the situation presented in the encounter.
A Lore check uses the value of the Investigator's Lore skill, plus any adjustments that the Investigator would receive from skill cards, allies, and Mythos card effects, plus any adjustment specified by this specific check. Unless otherwise specified, a single success is enough to pass the check.
A Lore check may be used to close or seal gates.
Note: A Lore check is not the same as a Spell check and therefore cannot be improved with the use of any bonuses specific to spellcasting.