Encounter III

Hello,

Having a hard time killing shaper without detonating any anomalies.
Been told i have a really bad build to attempt this, HOWA Molten Strike Jugg.

Have maxxed the dps on it to phase him as soon as possible.
1st phase he doesent even summon anomalies, but at the 2nd phase he goes invulnerable twice in a row and inevitably anomalies spawn and the more i run from them to try to squeeze some dps on shaper the more anomalies spawn and makes it impossible

I only recently decided to go for the 36 challanges and i think i need this challenge
The rest of the encounter III were easy.

Any tips on how to approach this fight ?
Or should i make a vortex or bane/soulrend character just for this challenge ?

Also am willing to buy the challenge :), if any are offering.