I have a cunning plan. Let's delay both the book and the orbs until we get 5 more sets of power stones, and then? Then....
Morbin' Curiosity
When he was informed that a Gyrocopter had landed in a seedy back alley, Algard ensured his latest and greatest test was prepared. Whatever she dumped on his lap this time, whether it be yet another Lost Dwarfhold that she tripped over while examining Waystones or Teclis himself with an entire barrel of milk, she would be at least equally shocked by this year's daemon-checker.
It took a few favors, but perhaps this would teach her to leave a written trail. Ulgu may be the Wind of tricksters, but at this point she could waltz in saying that she's become a Grey Dragon and gotten Cathay to expand Dragomas' non-aggression pact into a full-blown mutual defense pact and the only warning they'd have would be a short paper entitled "Dramatic Revelation: Gargantuan Notable Lizard Ulgu-Variety Real."
When she eventually sauntered into his office, he looked up from his stack of papers and raised an eyebrow, "Another full-blown Skaven civil-war?"
She gave him a small smile, "Not quite." Then she started rooting around in her pockets, and frowned. "Hold on," She said distractedly, "I'm sure I put them somewhere..."
As he watched in bemusement, she started pulling things from her pockets and piling them on his desk -- papers, quills, an Ulgu powerstone...
A slightly larger-than-average powerstone.
"Aha!" Mathilde said triumphantly, then groaned. "No, wrong one." An even larger powerstone joined the pile, then another one, then a diagram for some sort of fish-powered Waystone, and then a Ghyran powerstone, the largest powerstone yet, joined the pile.
Mathilde was frowning, and at this point the pile was getting ridiculous, and Algard knew exactly what she was doing. "Hold on," he said, "I think something rolled under the table."
He ducked under his desk, opened a thick lead-and-steel box, and quickly grabbed and threw its contents straight at Mathilde's head. It hit with a satisfying 'thunk', and the 'thunk' his own head received immediately after was worth it.
"Well played," Mathilde said, now holding two Hysh Orbs of Sorcery in her arms.
"It's morbin' time." Algard sternly rebuked.