From the
Dark Elf series of books by
R.A. Salvatore.
Aegis-Fang is an enchanted
warhammer wielded by the barbarian
Wulfgar, son of Beornegar. Crafted by the dwarf king
Bruenor Battlehammer, Aegis-Fang has a double-sided head of pure
mithril, carved with empowering
runes filled with pure
diamond. It's handle is an
adamantite rod.
The enchanted runes carved into Aegis-Fang give it the ability to
magically return to its owner's hand when thrown.