In what order should I put my skill points if I want to maximize the damage that Roland's Scorpio Turret inflicts?

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.

Solution 1:

I'd say max out both Impact and Sentry in the Infantry (blue) section of Roland's Scorpio Turret skill tree to 5/5 and invest just enough more points in the Infantry section to unlock the Guided Missile skill, which as the title suggests, causes the Scorpio Turret to deploy an occasional guided missile vs. enemies. I would advise also maxing this to 5/5 if you want to prioritize maximum damage output.