Board Thread:Questions and Answers/@comment-30827311-20170102075119/@comment-28013738-20170110102222

this is quite possible too. From bits of info I've read about Tales in Uzer, the bigger story where ToG is set to take place, in that universe there exist ancient towers where people dont know about their purpose. The towers had no doors and windows.

It could be possible that something might have happened causing one of the towers to probably "sink" underground, explaining the bigger the shinsoo resistance the higher you climb. just like how pressure gets higher the more you go down below sea level.