Iv had this idea for a while now, to "revive" crystal keys.
In every tier of donorzone there will be a crystal key chest that give better loot depending in what donorzone you are atm.
example
@home - Normal Chest
@::dz - Bronze Chest
@::sz Silver Chest
@::cz Gold Chest
Every higher tier of chest will have better chance of good loot or maybe even some unique rewards.
This will give the donorzones and crystal keys a boost.
Ps. Lemme know what u think of this idea