Relic weapon questions!

[Taika]

Well i have the quest with the différents book. 9 books i think and i'm at my second book to clear. So, i delete my weapon to have Rowena quest in idyllshire or i keep my weapon like this?

You don't have to delete your weapon, but there's no point for you to keep doing that quest. The new Heavensward relic quest is basically completely separate from the one you've been doing. The only link between the two is that if you have fully finished the whole quest line you've been doing now you are able to skip the first phase of the new relic quest line. But since doing the first phase of the new quest line takes much less time than finishing the quest line you're on now, it's not worth it.

So keep the weapon you have but start the new quest line for the new relic weapon quest line.