Just saw this pass by on FB.
Seems like an awesome new development.
MOAR UNLOCKABLE REWARDS! INTRODUCING CHESTS AND KEYS
A new way to get your favorite Vainglory content FOR. FREE.
Collect chests and keys to get skins, blueprints, ICE and more! C&Ks will randomly drop in Spoils of War after completing matches (Sorry, private games don’t count!) and have the best chance of dropping for completing ranked matches.