The air around Harinder would indeed be imbued by impure mana, this would cause him to be able to see perfectly in the imbued area, as well as causing an unusual sensation, a few modarately sized explosions would go off near Harinder, some of them would hit the guardian, but would not be close enough to harm him, as a result of the air being infused with impure mana.
Dies dodges successfully, the gloom lasers hit the guardian head on, damaging it further, the cracks would be more noticeable now.
The sword causes a large explosion on contact with the shield, shattering it and damaging Alexander, but not impacting him directly, the ground near Alexander would be split in unusual ways for those who could see it, the sword would then return to the guardian.
The fireballs hit the walls and roof, some of them do impact the guardian for minor damage.
As Silas attempts to grab the blade, it passes him by in an instant, impacting the ground behind him, the sword would graze part of his face, leaving a bloody line. The sword then returns back to the guardian.
The guardian is knocked down by the wind and hit by the lightning, the cracks become very large now.
The guardian stands up and says something, though it is difficult to understand. "N-o-I-c-a-n-t-l-e-t-y-o-u-l-i-v-e" its body begins glowing absurdly brightly, this glow cancels out the darkness in the room completely, nullifying it, the guardian levitates up to the center of the room before a violent explosion of mana emerges from its body and engulfs the entire room. As it fades, the group see a man in a lab coat fall to the ground from where the guardian previously was, the explosion having left the group with significant wounds and Jack having been blasted out of his wind form, however they were still capable of moving and acting.
"It's over." Says the woman that was with Harinder, her wall of heat seems to have protected her from the explosion almost completely, as she seems nearly unharmed.