Light of the Abyss

The chiseled wooden falchion is crafted from the
bough of a holy tree and is always miraculously
sharp. You gain a +1 bonus to atk & dmg rolls.
It deals an extra 1d4 radiant dmg to any evil target
it hits. It increases to 2d4 when used against any
undead creature causing blue tongues of holy
flame to flash along the weapon's edge.
In the dark beyond the Hellmouth, there is a terrible
need for light.