I love that there are crusaders and abilities that encourage you to try incomplete formations. But as my support characters have gotten better and better, the opportunity cost of leaving someone out increases. It would be great to see more strong abilities that benefit from empty formation spots to balance this. Overall love the game!!
Umbraunt, if you're having trouble getting to area 150, you probably don't have a lot of idols to spend yet, so I wouldn't worry. Feel free to do whatever objectives you think you can handle.
Are you playing on mobile or on the computer? Also, please put in a support ticket. http://www.kongregate.com/forums/12051-crusaders-of-the-lost-idols/topics/722364-how-to-report-a-bug
Sheena is available for missions, but isn't appearing on the bench, so can't be put in formations :/
Might be because I haven't unlocked Victor or Chiyome?
Awesome! We're really happy to hear that taskmasters are helping. :D