Speak to Fenris
Head to Fenris’ Mansion in Hightown and talk things over with him. Your words will sway Friendship or Rivalry and the quest will complete.
A Bitter Pill
After talking to Fenris, place him in your party and head somewhere in the Free Marches. Instead of reaching your location the Tevinter Slavers will catch up with you. Defeat them and leave the area, heading to the Holding Caves. Head up the north path to find embrium then defeat the Slavers. Loot the chest and check the southern path for glitterdust . Defeat more Slavers then check the southern area for a chest and a chest - complex . Open the chest - standard outside the Abandoned Slaver Den for a Tevinter Enchanter’s Cap .
Once inside the den head east and observe the Blood Sacrifice . Further east you will battle some Slavers then afterwards some Corpses. Follow the path around and defeat the enemies as you go, be careful of the fire traps. In the next room you will find an elf named Orana and several Slavers. You can have Orana work for you in your house if you choose the right dialogue options. Check the two chests for Spirit of 4:60 Black and a Tevinter Chantry Amulet .
Head west and take out the Slavers then check the chest for Reinforced Straps – an armor boost for Fenris – and the chest - standard for the Felon’s Punch-Gut . Follow the path north which inevitably leads to Hadriana. In the talks afterwards let Fenris choose what to do for the best option. Go to your mansion in Hightown and speak with Fenris to finish the quest.