When you earn one, it will appear as a golden chest under the "Consumables" section of your Keep, where you can click on it to retrieve a copy of one of the Heroes it can contain.
As of October 2018, the Legendary Chest can contain one of the following heroes:
According to several player reports, the odds of getting each Hero from the Legendary Chest are not the same. For instance, it seems that Layla has a lower chance to be pulled. However there is no official information about this.
The following percentages are based on a dataset of 204 Legendary Chests (from 3 events up to September 2018), which is certainly not enough for accurate results. Take these percentages with a big grain of salt.
- First introduced with the Meteorite event of April 4, 2018, replacing the Monkey King copies as the top reward.
- Legendary Chests were in the Legend, Alpha Vanguard & Eternal Vanguard rewards of the DeathMatch of May 2018.
- Replaced Succubus Nightmare as the top prize in Treasure Island starting with the event of July 2018.
- Preliminary data for 50 chests in June event 2019 showed hera going up to the 36% chance and Wraith king going down to 25%. The other generals seem to be unchanged.