So Vauban is due for a rework quite soon, and with hints from the higher ups, he seems to be going pretty far forward. And after I got my hands on Vauban Prime, I can safely say he is quite slept on. BUT, here are some ideas I have for his rework!
Passive: For every incapacitated enemy, Vauban does 10% more damage.
(While his passive is amazing as it is, I think this would be a fun alternative!)
Ability 1: Minelayer
With four mines at Vauban's disposal, he can dish out various status affects to his foes! Combine two different mines to create a different element!
(With Gauss as inspiration, Vauban now has mines of the base elements. Fire, Cold, Toxin, and Electric. Each mine has a 100% status chance when attacking. When placing two mines together, such as Toxin and Electric, they will form their respective element, in this case, Corrosive!)
Ability 2: Burst
Vauban triggers the mines on his belt and on the field to cause a devistating AoE based on the mine's element, destroying foes and aiding allies.
(To help Minelayer get some use beside spreading status, Burst is a damaging/support ability that lets Vauban become more tactical with his mines. When activating Burst, Vauban bursts with the AoE of the selected mine, while others on the field burst their respective element. The elements do their espective status to enemies with a strong blast, but to allies, Fire gives a burst of Health, Electric replenishes Energy, Toxin increases attack speed, and Cold camoflauges allies [ie invisibility] for a short time.)
Ability 3: Vortex Shield
Vauban throws a mine that turns into a deadly vortex, sucking in all enemies within range and crushing them, absorbing their atoms. After enemies are absorbed, a Nullifier-like shield quickly grows around the mine. The more enemies absorbed, the larger the shield will be. Enemies within the shield will be disarmed.
(This one is basically an improvement of his standard Vortex, mixed with the clear Corpus designs Vauban has. As the description says, if an enemy is absorbed, it will create a Nullifier-like shield that is gradually shot down my the enemy, similar to how we do with Nullifiers.)
Ability 4: Bastille
Vauban throws a mine that triggers a large bastille that lifts enemies into the air. When the bastille reaches the end of its duration, it becomes unstable and collapses in on itself, bringing enemies into the center and concussing them, causing a Radiation proc.
(Ah, Bastille. See the thing with Bastille and Vortex, is that their base mechanics are good as is. So, there's no real point in changing them... So why not just add onto them! This Bastille is used the same way as the currect Bastille, but with a mini Vortex and Concuss mine at the end.)
So, those are my ideas on a Vauban rework! I know DE has something completely different planned, so lets hope he gets shipped out ASAP!