Great Dagger

The simple, and yet surprising and powerful weapon appears in  Ultima VII and  Ultima VII Part Two.

Description
A great idea but shy of a wonder, the Great Dagger is perhaps one of the most ingeniously economical items ever produced. It appears to be naught more than an ordinary dagger, save for the large, red stone for a pommel. However, when one strikes with it, it is magically transformed into a two-handed sword. It hides well, and is light on the belt, but no more dangerous that an ordinary two-handed sword (which, of course, is in no way feeble).

Ultima VII
Great daggers may be found at the following locations in Ultima VII:
 * Buccaneer's Den, Hook's house at 88S/55E.
 * Buccaneer's Den, inside a chest in a house at 82S/63E.
 * In a cave at 72S/47W.
 * Isle of the Avatar, Dragon Treasure at 161S/191E.
 * Isle of the Avatar, inside a chest in Mage's Bedroom at 136S/165E.
 * Isle of the Avatar, Pirate's Cove at 143S/173E.
 * In possession of Kreg at Empath Abbey.
 * Serpent's Hold's Armoury at 157S/53E.
 * Selwyn's Hideout/Dungeon Shame, inside a chest at 5S/24W.
 * One can be found at the Shrine of Sacrifice at midnight.
 * Skara Brae, behind a staircase at 51S/56W.

Ultima VII Part Two
Great daggers may be found at the following locations in Ultima VII Part Two:

Trivia

 * They can also be found on the Serpent Isle.
 * According to Vetron's Guide to Weapons and Armour, the Great Dagger has an effectiveness rating of 11 (same as a two-handed sword).