Posted December 02, 2013
Ultima Underworld II does relate to the plot of Ultima 7. It takes place one year after The Black Gate and six months before The Serpent Isle. In addition to furthering the story of the Guardian (before all of the retcons struck in Ultima 9), it is also canonically where the Avatar obtains a particular item with which he begins The Serpent Isle. IIRC the actual acquisition was glitched so it didn't come up when it was supposed to in UW2 itself, but it is referred to in the "supply list" scroll that you start SI with.