Found this one out during testing. After receiving the first vision from Ria Silmane, I purchaced a cheap Non Target spell and Levitate, and headed to Rihad. After learning the location of Stonekeep from the Queen. I went through Stonekeep straight to the parchment she requests, and returned it to her. However, I then went back to Stonekeep. The Parchment was still there, but when picking it up it told me I had acquired the first of the Staff of Chaos, without doing Fang Lair! I then rested, and received another vision from Ria, and Jagar Tharn sent Goblins to kill me when I left the Inn, as expected. I went to Stonekeep one more time, and got the parchment, telling me the Tablet had been recovered for the Mage in the Mages Guild at Winterhold in Skyrim. I gave it to him and he rewarded me with the location of the Labyrinthian. However, returning and picking up the parchment again resulted in nothing. However this is a very quick and easy way to skip Fang Lair and Fortress of Ice.