Talene's Gift is an item exclusive to The Tormented Reach. After destroying all her Inner Demons, players can receive "Talene's Gift". Players who have reached Campaign Stage 16-1 can use it to add Talene - The Resurging Flame to their team. However, Talene - The Resurging Flame cannot be used in the same hero formation as Talene.
As proof of having destroyed the Inner Demons, after reaching Stage 16-1, Talene- The Resurging Flame can be used in your team.