The Kung Fu Chest is a limited time treasure chest offered in Castle Age. It costs 30 FP for one item pull from the chest and 80 FP for 3 pulls. It is available for players of all levels.
It was introduced on April 29, 2020 with a limited time of 144 hours (6 days) to use it.
It is similar to the Nightmare Chest (Limited). It differs from the regular chests in that there is a "Legendary" section. You have a 1% chance to pull a "Legendary" reward.
Note: You get more than one item when you get a drop from this tier, even though it isn't indicated in game (in fact the text after rolling even says otherwise):
Evolution Crystals: x3
Hero Potions: x3
Smelting Crystal: x5
Rare Smelting Crystal: x1
Occurrences
Apr. 29, 2020 with a limited time of 144 hours (6 days)
Dec. 2, 2020 with a limited time of 144 hours (6 days)
Jan. 31, 2021 with a limited time of 120 hours (5 days)
Notes
This chest doesn't include any new item or hero. It only gathers heroes which are for the most part obtainable through other Chests, in addition to Chen, Layla and 1 Favor General, Aesir.
To check when this chest was available in the past, see this page: Events Rotation.