Great Dagger

A great idea but shy of a wonder. This dagger is perhaps one of the most ingeniously economical items ever produced. It appears to be naught more than an ordinary dagger, save for 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). A simple, and yet surprising and powerful weapon.

According to Vetron's Guide to Weapons and Armour, the Great Dagger has an effectiveness rating of 11 (same as a two-handed sword).

In the Britannia of Ultima VII, one can be found on the Shrine of Sacrifice, another one, Kreg at Empath Abbey uses.

Trivia

 * They can also be found on the Serpent Isle.