Knights of Avalon reflects blue, and the monsters are still the same colors even with the update: mostly blue monsters, 2nd most is green monsters, 3rd most is purple monsters.
As a result, that means green, red and yellow are the good colors for this event.
Aside from Bane, all these heroes are good for this event:
- Nashgar (I’d keep both for now)
- Belith / Hawkmoon. Not for high scores as all offense is better for those, but good for keeping the team alive and just completing events.
Due to the somewhat limited time, I’d suggest getting as much TC2 or TC1 training started in your training camps, so you can get to leveling these heroes. If you have the trainings run overnight you can wake up the next day with a lot of training ready. Hit S1 8-7 as much as you can to get your source of recruits.
Also, generally speaking, the preferred rare heroes for Challenge Events are fast and are snipers There are exceptions of course, as you can see I recommended Brienne up above, who isn’t a sniper and is average speed, but that’s because of her skill. Or Muggy, who is fast but his skill is more support, however his tile damage is so good for his rarity that it makes him worth it.
Oh, and as tempting as it may be, don’t feed the 3* heroes any of your trainer heroes. They’ll level up too fast and their skills may not max as a result, which results in more wasted food maxing their skill when they cap at 3.50. Save the trainers for your 4* and 5* heroes.