Board Thread:Quests and Special Events/@comment-24568135-20150514144437/@comment-3552584-20150515160241

I've also noticed that there is a "level-cap" of sorts that is different for some towers' quests. For example, in some of the early island quests, any dragon level 10 and above, with the same # of matching elements, has the same effect on the quest's chance. For later towers, this increases to level 15, 20, and probably 25+.