This build is a pure Buff Strength + Duration build. It's a highly active and mobile build. It's also one I'm making with Helminth in mind.

Your Metronome is the ability you're going to be using most here. The point is to have long lasting and powerful buffs to Melee Damage, Multishot, Move Speed, and Stealth. Specifically:

Metronome Duration: 45 seconds
+118% Armor (metronome active)

Buff Duration: 34 seconds
+101% Melee Damage
+101% Multishot
+101% Move Speed

Yes, your Mallet and Resonator are going to be very short ranged. Toss them and let them wander around killing things and/or gathering the enemies, or don't to conserve energy. Metronome is the priority here.

Yes your Amp is basically going to be useless. But why not replace it with [Rhino]'s Roar using the Helminth. ;)

The damage buff Roar provides is not nearly as much as Amps 700% of course, but like I said this is a mobile build. You don't need to stand inside your tiny Amp puddle to get this buff.

As a bonus, Roar will affect your ability damage too (not Strength though). Amp does not do this, it just doubles mallet. A 100% Roar damage buff means 2x damage, so you'll be doing the same amount given by Amp. When you do proc [Energy Conversion] and [Growing Power], it will do even more... independently of how far it is from you. Throw it on your resonator and let it pied piper mutilate stuff while you go invisible music ninja and slice up priority targets.

Notable substitutions are [Streamline] for [Augur Secrets] if you want to go all in on the Strength. If you do that though, keep in mind that Roar + Metronome costs all of your energy. Thankfully, the cooldown for Arcane Energize fits nicely into your buff durations, so you should be fine. This is a great stealth melee option.

You could potentially push this further with an Umbra Forma, of course, though in the current configuration that just adds more survivability. [Guardian] is plenty helpful with that, so you could explore other options for arcanes.