A senior resources chest is an item in Evony TKR (The King's Return). It can be found after killing certain monsters or bosses, with some of them listed below.
The description of Senior Resources Chest in Evony TKR says:
Open to receive one or more resource items.
Senior Resources Chest is known to drop from a number of bosses or monsters upon killing, including Senior Bayar Knight and Junior Knight Bayard.
Note: This list may be incomplete.
Senior Resources Chest opens up to potentially any of the following items: