Talk:Thirteen Heroes/@comment-60.50.243.120-20160420102045/@comment-26825307-20160608004514

Ainz mentioned in the first light novel that there used to be a lvl cap of 40 so there might have been other lvl caps. If that is the case maybe everytime Yggdrasil was updated a group of players at the current lvl cap were sent into the New World. That might explain why each new group was stronger than the last and why it wasn't until the 13 Heroes 7th tier magic was introduced. Just a theory.