It’d be cool if there were some additional kinds of things that could drop from chests, beyond the normal currency/item/gem/etc. I’m thinking of things that could actually be used to change game play - such as ‘personal’ boosts. e.g. You could get an item (say, an Idol) that, when used, would activate a Storm Cannon (or any other) boost for X hours for your king. In addition to making chests a bit more interesting, it would give many people access to boosts that they wouldn’t normally have since most folks aren’t in high level alliances that have boosted everything. In addition to simply providing access to the current boosts, you could have items that provide all sorts of other enhancements. e.g. something that would lower food costs for battles for X hours, or boost gold% or XP, etc.
Personally, I think this would make the game a lot more fun as I’d get to play around with things that I virtually never do as my alliance can only afford two boosts. From a business perspective, you could also use this as another way to generate revenue if you allowed people to buy (with gems/money) these items that provided the personal boosts.