Alanna of Trebond and Olau's Sword Lightning
Lightning is doubled edged like a broadsword, but is said to be much lighter. The hilt is studded with gems and topped with a crystal. Said to be a relic of the Old Ones, Lightning also has mysterious magical properties. These magical properties are first shown when the sword saves Alanna from death.
Alanna: The First Adventure (First Appearance)
Tamora Pierce
Alysia Derry-Chavez
Image Source URL: http://static.tvtropes.org/pmwiki/pub/images/518W7A1ZWDL.jpg
Novel
Lirael's Sword Nehima
A blade infused with Charter marks, Nehima was created by the Wallmakers and bears the inscription "The Clayr saw me, the Wallmakers made me, my enemies Remember me". The Charter marks also give the blade power against the dead.
Lirael (First Appearance)
Garth Nix
Alysia Derry-Chavez
Image Source URL: http://ecx.images-amazon.com/images/I/512TFDP5T9L.jpg
Novel