For the fallen half, I used Vex Mythoclast. 2 reasons, a) it is new to me, b) probably the best counter to the solar shanks.
Second half I switch to Oversoul Edict. Not a better weapon for taking out shielded knights in arc burn.
Always had my arc Efrideet's Spear as a special. Just demolishes in arc burn. One hit yellow enemy kills with headshots.
Heavy didn't matter as I barely used it.
English
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Song of Ir Yut is better for taking out knights with arc burn.