Awesome cornerstone submissions that can add major elements to your campaign world.
According to Ars Geotia the standard formations of power consist of ley lines, confluences and founts. this system has been long accepted, and is quite incorrect…
A casual remark by one of the party about something met on a previous adventure leads to a summons to and grilling by the Mages' Guild (or equivalent), probably resulting in an expedition back to that area to recover the things for 'study' by the Guild. The party's presence will be 'requested' for this expedition.