Through a side quest, my PC found out about Elphone the Bard of Willows Weep. I requested a CDQ and discovered his lair. That was the place the hammer that destroyed one of the three pillars was found.
Elphone's notes were never taken and I recovered them. The recent "druid meeting" Mixafix ran last weekend, was a lead into PC's getting more serious about destroying the two remaining pillars. I shared what I had found and a deeper discussion of those notes took place.
As it stands now, the notes lead to more riddles. We travelled to several libraries and gathered more volumes of lore, stories and poetry.
I asked Mixafix about creating a forum to post the various notes and he suggested I do it here.