I had someone suggest to me that I should use Tiche against Godfrey when I started playing Elden Ring (I was very under levelled and struggling a lot to get him to even second phase, though I did not know that at the time).
I looked up how to get that summon, and it simply was not even possible for me to get, it has a whole storyline to lead to where you can get it, that involves bosses far more difficult than Godfrey. It turns out that the people suggesting it were on NG+ and just didn't even think about not having it or how involved it was to obtain.