AD&D 2nd Edition » Magical Items

Foe Finder - a Long Dagger +3
Magical Weapons And Armor
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A powerful magic weapon, in the form of a mithril-bladed dagger with a Star Sapphire blade-jewel set near the hilt.
Possesses the following powers:

• The Blade-jewel will glow with an eldritch blue light if any enemies are within 100 feet of the bearer.
• Does double damage (SM: 2d6/L: 2d4)to evil-aligned creatures.