Here are the stats of Legendary Final Boss Stage. Tap on img to see. 
Used the same strategy as I have in previous challenge events. Make a diamond in the wave before boss and make sure all specials are charged before entering. Fire everything and carpet bomb to finish them off.
Wu Kong - Wilbur - Falcon - Scarlett - Rigard
Post your strategies!
If we’re just talking about completion then…
…Proteus…
…Always Proteus
Proteus + BoldTusk/Wilbur is a solid trio. Add your best support/strength to that in any color but green and you’ll do well. I put in G. Jackal and Triton.
After not being able to use Proteus in Pirates, you darn Skippy I am taking him into Wonderland and all the other challenges that don’t reflect purple. Just wish I had 15 more Monk emblems to take Li Xiu to +12. Her withstand is coming in handy against rabbit and Alice. Has anyone else been noticing that when pierce happens, on the opponent bypassed pops up?
So after finishing all 3 events (legendary with 3393 team power) a few key things I would advice to do whenever possible:
-on Rare: Gato is a really strong ally, he will block the debuffs that cant be dispelled (the poison immunity is specially nice).
-on Epic/Legendary items that are better suit for exploting this event bosses, seems to be Time stops. I found myself still using a classic carpet bomb setup with x5 axes, x5 bombs and x5 dragons. But mostly because I do not have a roster that can take advantage of Time stops with mana control utls such a Proteous, Lil John, Li Xiu, Lady of the lake and so on.
My take for Legendary has been using 2 Riposte heroes. And charging up White Rabbit and Alice, Hatter is a brutal counter for a buff heavy team. Luckly he is in the middle, so charging him up by mistake is difficult. One should always time out Hatter’s ult so he uses it when you have 1 turn left on riposte or non at all. 2 turns left is acceptable as long as Alice is no where near to use her ult (White Rabbit will use his ult first, before Hatter anyways so he is irrelevant). If you can also get autoattacks to riposte before getting your buffs stolen that is a big plus.
Team I used for Legendary completition:
(click to enlarge)
Good luck on the event peeps.
Is it possible to use time stops and dragon atack on epic?
I can’t
Sorry, only 3* and below battle items for Epic tier.
Got through Legendary with just 4-star heroes, but 2 of them had to be Proteuses. Might have been able to get by with just one + enough mana pots.