This is the build I use for mindless disruption runs. Using Hildryn allows you to ignore the energy drain debuff that crops up from time-to-time and gloom replacing [Balefire Charger] lets you slow everything down to a crawl to provide plenty of breathing room and time to locate and slaughter the big bads.

Molt Augmented is not really needed as you get to 268% (need 272% for the max slow from gloom) strength with the build + [Growing Power], but I had it on before I used forma to be able to fit in a full [Blind Rage] and [Umbral Intensify] and just leave it there in case I want to shift things around at some point.

For weapons, I tend to use a [Laetum] and [Stropha] Heavy attack build, along with whatever primary weapon I'm currently enjoying the most (big fan of the [Tenet Arca Plasmor])

I use Unairu for my focus school for the extra option on defense stripping beyond Pillage

I also use Magus Lockdown on the off chance I get too close and my Gloom gets turned off, I can still lock them down to re-position and turn it back on