Stupid Knight
Silva informed the Guardians to leave as many of the intruders alive as they could because now that he knew about all the types of summoning, he wanted to try them out, and one of them was undead summoning.
He went through the System and found a spellbook on undead summoning; he needed bodies for this to work.
He returned to the hall where over seventy remaining men lay there like bags, completely tied up with spider webs.
'The first thing I have to do is completely kill them. Until they die, I can't use them,' Silva thought. He pointed his hands at them and used a dark spell.
"Hands of darkness." Several black hands came out and started choking all of them. In less than five minutes, the mass murder of over seventy people was complete.
Silva didn't bat an eye or even show any emotions. Immediately after they all died, he activated the summoning spell, causing a massive magical circle to appear under all the men.