" "My task is to heal this shattered world, Lord British," said the voice. "And I seek to enlist thee in my cause. Be warned that in this case, healing carries with it a terrible price."
Concern warred with curiosity on my liege's face, but ever one to shoulder a burden, he straightened and faced the gash in the air bravely. "Name thy price."
"A shard of a universe is a powerful thing, and universe shattered is always in danger from the powers of darkness. Already three shards were turned to evil, and sent to plague the original universe in the form of Shadowlords. Many times have I brought the Stranger back to Britannia, to preserve it from its own folly or from outside dangers. Yet as long as the world remaineth in pieces, it remaineth vulnerable. We must bring the shards into harmony, so that they resonate in such a manner that matches the original universe. Then the two universes shall merge, and be again as one.
-From book "my Book", by Sherry the Mouse
Sherry the Mouse is the author of "My Book" which tells about the concept of the shards and the Time Lord. It is rather unclear who the author really is, surely a mouse could not write. "