I would recommend arcanum dust if you need the energy, but I would personally try my utmost best to use 3x forgefires
that’s 45 flat elemental damage, 150% ele damage, and 210 DA from just augments alone.
I would fix resists using fateweaver’s chestpiece with necessary components. things like purified salt and imbued silver are great as they confer on the spec both defensive and offensive stats