The Arben Sword a Quest-item????

But how?
For which quest? I used it frequently in my earlier playthrough ... ! I also see it has a "0 Gold" value, but I was confused too, because it don't stay by my Quest-items in my Inventory.
But now I remember the first time I played Divinity I didn't do the bandit quessts and Tagos' Axe stay in my Inventory, also with a "0 gold" value
The funny thing is I now discover I can battle Tagos & when he give up (before he die!), I can keep this Axe AND I solved also this quest for Tagos! that are two birds with one stone
But I can't now remember if I get rid of this Arben Sword or not

...
I go for a look in the inventory of my earlier hero (jusst before he must do the final battle).
But I can't remeber which quest it was ...

I'm realy suprised (in a positive way) about the secrets in Divinity ...

... I play now my third character and I discover still some secrets

...