Golden Orrery (at the highest level) has a 20% chance of giving 2 fragments of one up kits.Golden Crops (at the highest level) gives fragments of one up kits.

Can be purchased in the Antiques Dealer.

Since the 2016 Fall Event the One Up Kit have appeared as one of the possible rewards in many events.

From Daily Challenges as a reward from the Item User's Chest (15% chance).In the Guild Expeditions it can also be obtained as a reward for completing the 12th encounter of level II and the 12th encounter of level IV difficulty.During the Guild Expeditions the One Up Kit is one of the possible rewards from the rare Jade Relic (28% chance).Fortunately there are a few ways to get it. One Up Kits are fairly rare and desirable items. The One Up Kit was introduced during the 2016 Fall Event and has reappeared in later events. The One Up Kit can be used by its owner to upgrade a special building acquired in an earlier age to the subsequent age.

Upgrades special buildings from a previous age to the subsequent age.

Alcatraz level 3 forge of empires