Ultima IX - and the series as a whole - enters its final hour.
If you prefer to ignore Raven's bad advice, you can skip past Terfin's front gate with the Teleport spell (or clever item stacking) and complete the final dungeon in less than ten minutes. Here's a video of this method:
The Teleport scroll can be found in Serpent's Hold in the Arch-Mage's room. Search behind the ramp to the exit door - there is a sizeable gap between it and the wall.