The is the end of Volume 1 Rebirth and System with Volume 2 Conqueror Mode next
Conqueror Mode is made to help Marcus and also so that he can get more skills and utilize the laws and all of his powers to the best with the addition of getting summons for cheaper prices if not free.
It can not be used often as the amount of time a person stays in the conqueror mode the same time before they can use it again like in Marcus stays in for 3 years he can not use it for 3 years after he comes out.
The starting point of each world is different depending on Dream or Marcus.
For the next Challenge and or Conqueror you can vote in the comments I will may make a poll on my patreon to make it easier to keep count.