Yes this is a ridiculous investment of 7 forma (no umbrals) and yes this is legitimately what I use on a regular basis (arcanes differ).

Why these stats?

• Umbral Vitality and Umbral Intensify to reach the minimum of 145% Power Strength for max slow with only 2 mod slots.
• Max of 306% Duration to get the 18x Null Stars (90% damage reduction).
• Adaptation for an additional layer of survivability.
• Neutral Efficiency because [Molecular Fission] makes it so [Nova] only really uses her fourth and with high duration it does not need to be recast a lot (I rarely run into energy problems).
• Low range and [Molecular Fission] makes for a consistent 18x Null Stars at all times.

There's also an Aura Forma since [Nova] switches out her aura for [Power Donation] if the goal is Speedva.

The Exilus slot was initially fitted with a dash polarity for [Handspring] but now that the updated [Primed Sure Footed] is better, I might add an Umbral Forma to this build to fit it in. For now [Coaction Drift] is a nice fit.

7 Forma Normva Build
7 Forma Speedva Build