Heine had not come to this conclusion solely based on today's events.
A significant portion of the evidence came from Lakaz and Lloyd.
The former, although unable to divulge much, had information extracted through roundabout inquiries which pertained to the actual function of the soul furnace barrier of the Dilapidated Palace.
This could also be obtained from the players' side, with more specific parameters; however, the players did not know how to articulate it and could only wait to operate it on-site.
Lakaz's obstinacy stemmed from the fact that, although dragon tales also existed at the time, people generally did not regard dragon materials as top-notch.
As a master blacksmith, he inevitably fell under the sway of this consensus.
The corroboration provided by Lloyd was that in at least the past several hundred years, there had been a place that still held a similar view.
Zanro Plateau.