A lv6 candy 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 Lv6 Candy in Evony TKR says:
Open to receive a random item.
Lv6 Candy is known to drop from a number of bosses or monsters upon killing, including Pumpkin Monster.
Note: This list may be incomplete.