This [Noctua] build is for a specific [Dante] setup.
5 Forma - Dark Mage - Noctual Destruction
The Build
Pretty straightforward setup meant to build status for [Galvanized Shot], procing toxin and slash and utilizing [Archon Continuity]'s corrosive armor reduction passive.
Secondary Arcane
[Noctua] even though an exalted weapon, it counts as a secondary, so there are arcanes that can be proced by equiping onto your secondary weapon arcane slot, but using the Noctua.
Cascadia Overcharge - Grants 300% crit chance if you have overshields.
There is the trick:
[Dante] has overguard, but since you have [Augur Secrets] on, it converts a portion of your energy spent into shields. If you are at max shields, you gain overshield and that procs Cascadia Overcharge. You can easily keep your overshield up by having a ton of overguard to defend it.
This crit chance bonus applies to your Noctua, and to both your primary and secondary weapon.
Secondary Outburst - It consumes all combo count points on swapping to secondary weapon and converts it into critical chance and critical damage (340%) for a set duration.
Melee
Since [Dante] is pretty much a ranged warframe, melee weapons are kind of useless, though there are a few options to choose from that can contribute to your damage output.
Ceramic Dagger Incarnon - Build up combo and then swap to [Noctua] to gain bonus crit chance with Secondary Outburst. With [Ceramic Dagger] you can easily have a decent amount of crit chance constantly up thanks to its incarnon evolutions. Even better if you have Melee Crescendo Arcane - You gain initial combo count for finisher kills, and the bonus stays untill you die. Basically you can have 12x combo all time and that is converted into a total of 360% bonus crit chance.
Furrax Wraith - It has increased initial combo set to 2.0x which is a good base for the Secondary Outburst Arcane. You can use Amalgam Furrax [Body Count] which grants +40% fire rate to secondary weapons. This is a nice utility for [Noctua] since it has low fire rate and this helps a lot.