I've just maxed the Refire and Deploy skills of the Soldier / Roland to maximize the reduction of the cooldown of the Scorpio Turret skill. I am now thinking of increasing the damage of the Scorpio Turret.
It seems that I have three skills (from the Infantry and Support skill trees) to choose from if I want to increase the damage of the Scorpio Turret: Sentry (increases Scorpio Turret damage), Guided Missile (Scorpio Turret launches guided missiles in addition to using its regular gun) and Barrage (increases the number of shots the Scorpio Turret fires in each burst).
In what order should I put the next skill points that I get to maximize the damage that the Scorpio Turret inflicts?
Also, what if I have an Artifact that adds elemental damage to the Scorpio Turret? I currently have an Explosive-bolt Artifact equipped.