So if I get it correctly, the driver drone reduces the overdrive cooldown for every kill and this effect as an internal cooldown of 15s?

Well, unless the devs explicitly mentioned that I will still treat it as a bug. I believe this is how the devs implement the spawn protection: abstract class Protection { // ... } class SpawnProtection extends Protection { // ... } And they forgot Hornet's OD ignores all protections.

Back in the game not long ago, what is the best drone for Vulcan + Titan except Crisis, which it causes me a house to obtain it, not a big fan of loot boxes?

Back in the game not long ago, what is the best drone for Vulcan + Titan?

Hornet's overdrive ignores the temporary invincibility of a tank which is just respawned.

Hammer, Twins and Ricochet are short-range turrets, obviously, Vulcan will and should perform better in mid to long-range. As for Smoky and Thunder, their playstyle is quite different from Vulcan. You can adopt the "hit and run" tactics (shoot, hide behind cover while reloading, and repeat) using Smoky and Thunder to hit long-range targets to deal respectable damage with a minor cost. Yet, to deal the same amount of damage, you have to hitting your target with Vulcan for significant amount time, which is unlikely since most players will back in cover once they are tickled by Vulcans.

Also, the devs added projectile speed into the equation. That means Vulcan is no longer hit-scan. This is exceptionally noticeable when using Incendiary band.

So it is currently unobtainable?

As the title suggests, how to get the Mysterious Red shot effect for Vulcan? I know most of the shot effects are from containers. Yet, I can't find the Mysterious Red in the list of possible rewards. Did I miss something?

First of all, I'm a Vulcan main, as shown in my profile. And I agree this combo is pretty strong. In my opinion, Vulcan has the following disadvantages: It will overheat. The turret rotation speed is ridiculously slow while firing. Its damage is neglectable in long-range. These 3 disadvantages combined makes Vulcan quite situational. Yet, this augment combo solves (1) (dah) and (3) (in long-range, you just "tag" your target and let DOT do its job) while making (2) worse (since you have to keep firing for Incendiary Band to be effective). And yes, the decrease in projectile speed has quite an impact on the overall effectiveness of the turret. It makes it almost impossible to track moving enemies in mid to long-range. I agree that this combo has to be adjusted. Yet, I don't believe simply making these 2 augments mutually exclusive is a good idea. I mean to be fair, no one is gonna use Incendiary Band if you have to overheat yourself for it to take effect. The cost is simply too significant.