Old Wounds is a main story quest available in Assassin’s Creed Mirage.
Your objective is to look for Nehal back home.
Here’s a walkthrough and guide of Old Wounds in AC Mirage.
Look for Nehal back home
Head back to the city where Basim was from to look for Nehal. The location is provided in the map as shown below.
Enter the house to look for Nehal.
Basim and Nehal will be reunited after some time. The quest ends here.