How do you unlock Traces of Darkness

[krodych]

I'm trying to do the bingo and it's my last square for the front side I have no idea how to get this quest.

[ralf542]

Complete Ruins Exploration, Quarry Exploration, and Kuron Exploration. And maybe Successive Practice: Harkotan too(swiki says you need this but english wiki dont mention it.)

[Moffen]

Please use quick questions for this sort of thing