A Package from Gascard DuPuis is received at the beginning of Act 3 if you spared Gascard's life at the end of All That Remains in Act 2.
Letter
Hawke,
I'm probably the last person you wish to hear from. I played a regrettable part in your mother's death, and I will live with that the rest of my life. You could have killed me, but showed me mercy. I have decided to use this second chance to change my ways. I am giving up magic.
I found this magical artifact in my stash. Perhaps you will find some use for it.
Gascard DuPuis