Red crystal

Reached the crystal guardian and gave up. This Necromancer is much more powerful than me, with several Grand Artifacts in each slot. Plus, he has a full set of Dwarven equipment. I understand that this is payback for lost time, but it's hard to find something specific. I found the shipyard workers thanks to a personal tip from the author, and I figured out the day of the week by chance. I agree that when you know everything, there's some logic to it. I think we need to provide hints in the scenario, as similar questions exist for others.
I personally really liked the map, although that's a matter of taste. Big respect.