So all I have left in the Boss Invasion is the last stage of earning guild points, but I don't have enough courage left to run the event dungeons and it seems like the only way to get more courage is 1000 gems (or $7.99) for 50 more courage.
I'm discouraged - there ought to be enough courage available to complete the event without needing to pay so much.
If I'm missing something obvious, please forgive. I fought hard to set aside some Real Life time for this event (missed the last one) and am just surprised to be stopped so close to "the end",
(I spent down my gems runeing up my heroes for this event and right now 1000 gems is a lot until I can replenish...)