I don't understand. How does a crystal ball make Drawmij's instant summons useful, even for NPCs?
Step1: Get murdered and robbed
Step 2: Get resurrected or activate clone
Step 3: Use your brilliant mind to deduce when your robber may be sleeping or bathing
Step 4: Check with crystal ball to be sure. If this fails, be patient and check again later
Step 5: Get your staff of buttkickery back while paying the small price of a sapphire
Step 6: Start plotting your revenge