Light

Darkness is truly the enemy of the adventurer. If it is night, or the party is deep inside a dungeon, creatures of evil will use the darkness to attack clandestinely. With Light, things are literally brightened up, and a light source will show what is normally hidden by darkness. This is stronger than the Glimmer spell but weaker than the Great Light spell.

White potions fulfil the same purpose as the spell, but less effectively, acting more like the Glimmer spell.