This is a DPS [Mag] with some support and survivability thanks to elemental ward.

The main form of DPSing is via Magnetize. With these settings, it will have enough pull force to get most of the enemies in several meters around the target sucked into the bubble.

Just shoot inside the bubble to see huge numbers kill anything.

The duration and the augment will allow for long lasting bubbles; in high level content, consider fighting from inside the bubble, much like [Limbo] does with Cataclysm and use pull to throw more enemies inside it.

[Chroma]'s Elemental Ward set on Ice or Electric will give you either a good boost on armor (if you run out of shields you won't be oneshot) or a passive crowd control (from electric arcs). The augment is for giving squadmates some support and help with crowd control in case you use electric ward. If you play solo, consider [Adaptation] instead of [Everlasting Ward].

Use weapons with high punch through to maximize damage inside the bubble.

Steel Charge is not mandatory, but if you use a melee mainly, helps with damage. If not, use Brief Respite to help shield-tanking.