Ok, Everyone has their own favorite method for training their heroes. I’ve trained a ton of them and here is what I’ve come up with that works best for me. I have heroes to use, so I am in no hurry. I am impatient, but really am in no hurry.
One point that I’d like to make starting out is that using a hero of the same element gives more experience toward training. For example. Training a 5* hero with a 1* trainer at Level 1-1 same element gives 180 exp. Using the same 1* to train a 5* of a different element gives only 150 exp. With this being the case, I Rarely ever use a hero of a different element to train a hero. About the only exception is when I am very close to the max and I just want to get to an ascension or finish off maxing a hero.
I train one hero in each element all the time. That’s 5 heroes at a time. I used to only feed 10 heroes at a time to maximize the chance of raising the power, but that got frustrating as I could only train infrequently depending on how often I gathered heroes of a certain element. I used to play a game called Risk and that game used a 6 sided die–several of them actually. Rolling a 6 was boss. I was really good at rolling 6’s. It wasn’t that hard. So, I adopted the method of feeding my heroes just enough feeder heroes to get to 16-18% chance (16.667% is the chance of rolling a 6 on a 6-sided die) of raising the power.
After I started doing that, it was rare for me to get to the third tier on a 4* or half way through the second tier on a 5* with less than a 8/8 power. That is what I recommend doing when training heroes. You can call it the Die method, the Craps method or the Otto method. Whatever you want. It seems to always work for me.