A few ideas to discuss.

[Chosen]

Personally, I would kill for a quest line system Brass. The more RPG for me means better. As for the challenge scroll system, no idea I barely played NTG. I did experience 1 Boss Round and please oh god yes add something along that lines? Maybe certain tiers or crystals or MAYBE a "trophy" that can be dropped from the boss or quests would be hellagood. For that challenge system though the rewards could be something along say maybe small amounts of coins or guns that are leveled to that challenge (maybe a new tier as well with a "non-tradeable" fix on it) < ----- Just my suggestion because some people would be lazy and just buy the challenge reward if it is cool, this would make it where you have to do it . *All my opinion right there, if you do not like it. Cool Story.*