Chests

Every chest other than the wooden chest requires their respective key.
Ace Chests only spawn on the Archives and Chambers, with one guaranteed in the Forsaken Tower. Ace Keys can be dropped by Act 3 and 5 minibosses.
Each chest's loot percentages are listed below:

Chest Type	Common Item	Uncommon Item	Rare Item	Epic Item	Legendary Item	Ore	Money
Wooden	70%	5%	0%	0%	0%	5%	15% Blue Diamond 5% Red Diamond
Bronze	65%	35%	0%	0%	0%	0%	0%
Silver	0%	80%	20%	0%	0%	0%	0%
Gold	0%	25%	65%	10%	0%	0%	0%
Ace	0%	0%	0%	50%	50%	0%	0%