From April 8th until May 6th, you will be able to swap two heroes.
Mira, 
Envydiel, and 
Lysander can’t be swapped.You must clear Stage 19-40 to participate. If you have not swapped any heroes during the event, you will instead receive 10,000 diamonds after the event ends.
If you want to understand the best way to use the Hero Swap, take a look at the guide below.
Awakened Ezizh is by far the weakest awakened hero and he can do his job pretty well even at Legendary ascension. 
Awakened Talene is the second weakest awakened hero and she can also work fine at Legendary ascension. So if you have invested on any of them, it is a good idea to swap Awakened Ezizh or Awakened Talene with another awakened hero. 
Awakened Brutus is the third weakest awakened hero in the current meta. 
Awakened Thane, 
Awakened Baden, 
Awakened Antandra, and 
Awakened Solise are still useful heroes, but could be considered for swapping out for better heroes.
Eugene is one of the best awakened options to be swapped out for better heroes because he can be ascended via Guild Store.
Awakened Shemira, 
Awakened Athalia, 
Awakened Eironn, and 
Awakened Thoran. But 
Awakened Lyca, 
Zohra, 
Awakened Lucius, and 
Awakened Safiya are also great heroes if you already have the top 4.
Wu Kong is the weakest Celestial hero and the easiest Celestial hero to ascend. Swapping an ascended Wu Kong with another celestial or hypogean hero is a great investment. 
Flora is not bad, but she is also very easy to ascend compared to all other Celepogeans, so swapping her can be a good idea if you do not have an ascended Wu Kong.
Zikis, 
Leofric, 
Titus, 
Mezoth, and 
Vyloris are completely off-meta Celepogeans in the current meta. So if you have heavily invested in one of them, you should consider using them as your swap instead of Wu Kong or Flora. 
Athalia, 
Audrae, 
Zaphrael, 
Morael, and 
Framton can be useful depending on your hero pool, but they are very niche heroes and definitely less relevant than Flora in the current meta, so they might be good options too.
Daemia, 
Liberta, and 
Knox, but
Lavatune, 
Aurelia, and 
Lucilla are also very valuable heroes. To see the full Celepogean ascension priority, check 
Oscar, 
Rigby, 
Walker, 
Khasos, 
Solise, 
Seirus, 
Ulmus, 
Shemira are the worst heroes in the game. Consider using them at this event if you have heavily invested in any of them.Also, you should consider how much you’ve invested in each hero’s signature, furniture, and engraving when choosing which hero to use in the Swap Event. Sometimes it can be more advantageous to trade a mediocre hero with level 60 engraving and level 9 furniture instead of trading an ascended bad hero with 0 engraving and furniture, for example.
To help you decide which signatures, furnitures and engravings to swap, check out each faction investment guide: Lightbearer, Mauler, Wilder, Graveborn, Celestial, Hypogean.
