Spark players: how do you deal with reflecting shield turds?

I'm juuuuust hitting T15 maps and whenever these guys show up I just start a new map but now they made me abandon a particularly juicy map I was excited to run; 7 mod shield bro (prox tangibility, lightning res, regen, revives minions, some other stuff) couldn't be toppled by my current damage.

Please... Don't say get close so he swings and roll behind, that only allows for 1 attack per roll and he's regenning faster than I can currently damage him with 1 attack at a time.

Do you guys have a spell you slot or something for just these guys?

EDIT: Until I have more damage, having Arc on my bar just for these guys worked out great, thank you Tirini!

Slotted Arc with just 3 supports and it worked out nicely.