An 'endgame' tank [Vauban] build a bit heavy on the Forma. Flexible slots include Brief Respite which can be changed for Growing Power, Energy Siphon, or whatever suits if not doing very intense high-level missions. Augur Message evens out duration nicely but it can be sacrificed. My choice is to switch it out for Streamline, or any augment like Tesla Bank or Repair Dispensary.

The core of this build are the Primed and Umbral mods. Duration is always a must on [Vauban], and the energy capacity plus Dispensary's energy orbs make 100% Efficiency a comfortable amount. Without the Umbral mods the survivability would be greatly hurt, and the high power Strength makes your [Flechette] Orbs able to clear out anything in the room and quickly strip armour with your Bastilles.

For Arcanes I've always been partial to [Guardian], since the added armour boost works well with Bastille's, and the healing will be done by your Dispensary's health orbs. Since my personal playstyle involves using the Morgha as a main weapon and replenishing ammo with Dispensary, Arcane Tanker works well but is another flexible slot in which Energise or Grace work just as well.