This might have already been answered and I just haven't found it, but how do you increase the level of the clan chest?
For every monster you kill there’s a chance it will drop a monster chest (when you kill a titans a chest is guaranteed) Every monster chest you open gives keys used to open open a clan chest (take 20,000 keys) Every clan chest you open gives XP towards going to the next clan chest level. The next time you open a clan chest, don’t quickly click through it, the last animation shows you your clans progress towards the next clan chest level. It gets substantially harder the higher you get in terms of how long you spend at each level.