Lore

Determines your ability to discover secret passages, use crystals, and identify items. Your party's highest Lore skill is automatically used.

Secret Passages

Secret doors appear to be visible regardless of Lore skill, and usually appear as slightly glowing purple symbols on dungeon walls. Clicking on the secret door opens it if the party's highest Lore skill meets a certain requirement. If the party's highest Lore skill is not yet high enough, a message will inform you what Lore level is required to open the secret door.

Crystals

Later in the game Blue Crystals can be found, and the Lore skill description suggests that certain Lore skill requirements may be required to use them.

Unidentified Items

Lore skill can be used to identify items, and save on the cost of paying a vendor to identify them.

Right-clicking on an unidentified item will attempt to identify it. If the party's highest Lore skill meets a certain requirement, the item will be identified, otherwise, if the party's highest Lore skill is not yet high enough, a message will inform you what Lore level is required to identify the item. Otherwise, a vendor (usually magic shop owners) can identify the items for a fee.