Them telle to set aside a deck of 20 cards. Some card instruct to check card in this deck aside and discard it after. Do they make a second discard pile aside or the card go to the normal discard pile ?

This is very important for my deck that play in my discard pile.

Thx for the answer.

it will be in the same discard pile ))

You entirely sure ?

If i discvard for exemple unexpected courage from my set aisde deck of 20 cards. I put i in my normal discard pile and use dwarven tomb to put it in my hand.

I also play it like that, nothing say there is another discard pile.