Mon Feb 05, 2018 12:21 am
The heroes picked will always give maximum chance at max level, and the game always picks 3* then 4* then 5* in that order. If it is picking your 5* heroes for expedition, then you need to level some 3* hero of that class to max level 20, and it will auto pick that instead.
I.e, The game already auto picks the lowest rarity 3* heroes. You just need to have a few max level ones hanging around.