Severus Appears 

While burning corpses, he left out those of the demons.

When all the corpses were burnt, Zydrax changed the magic circles attribute, turning it crimson red.

This time, the rivers of  blood spilled across Quartez rose into the air.

Stretching out his palm, the blood flew towards him, stopping three feet above his palm.

It coalesced, taking the shape of an orb as more and more blood gathered.

Ten minutes later, all the blood had coalesced into an orb big enough to hold four of him and still leave space.

Its shadow completely covered Ezra's figure.

Note, this was after being compressed.

It would've at least thrice as much if Zydrax did this one the day Alvarach carried out the massacre, much of the blood had dried out.

Not that he was complaining.

He passed control of the blood orb to his left hand and erased the magic circle stretched all over Quartez as the dome made for peak masters broke off.

This relieved him of unnecessary pressure.