Masterwork Inscribed One-Handed Haft Schematic

Reward from Pursuit through the mountains, War Table mission; with both Cullen and Leliana.

Can anyone else find if this is a potential drop from chests or a singular reward from the War Table mission itself? Influence is important but I find unique however useless schematics are preferable than influence as you can buy it from whats his name in Skyhold.