Percival made his way to Londinium with his merry friends and wrote two letters, one to Prince Caelum and one to Princess Weiss. Then he met both of them, telling of his plans and giving them time to think his offer over. He also met Bettrys and was vaguely ominous at her - as well as another Druid friend from the past (Nola).

He's also letting both Caelum and Weiss participate in the summoning itself, so they can see what he has to offer themselves. This will only go well...

Week two is a catastrophe pre-written.