Gheh. On my first run, I killed the Absolute's team, didn't ahve that Lyre or the knowledge to use it... I hadn;t a clue how to pass the Tollhouse. So what I did was, leave everyone in camp.
I was a Wood Elf Rogue/Monk with Mobility and Crusher's Ring, so SUPER bloody fast. Turn based mode, dash/ cunning dash and passed through the tollhouse in a single turn. Walked straight up to the moonrise Travelpoint, got my party back and that was that. I was so proud of myself.
You find the lyre and instructions on Mintharas body after you've killed her.