The Final Painting

The Final Painting was an altered representation of one of Aguilar de Nerha's genetic memories.

Aguilar's Journal
''The Inquisition treasurer's underground storehouse was no match for our stealth abilities, and the fourth painting is ours again. Now, we just need to take back the final piece!''

The fifth painting is being kept in a heavily-guarded mansion in Salamanca, belonging to Diego's good friend and weapon merchant, Gabriel Dominico.

''Gabriel is cautious and his mansion has many alarms. We must remain unseen and silently escape with the artwork.''

Reference

 * Assassin's Creed: Rebellion