The usual

Demons either sneakily attack and corrupt from shadows...

Or simply don't give a fuck and go for all out battle.

Right now, Xue Lightning Family was looking at the huge amount of corrupted races leaving the dark violet crack! Various races, various lightnings. 

Those lightning were always either full dark violet or with a tinge of dark violet color. It meant that demons were studying these lightnings! Xue Ren immediately thought like that, then stood up.

He wasn't going to fight with the pillars. That's naturally the job for patriarchs here.

Instead, Xue Ren planned to move with his ladies to fight against lesser demons. Everyone was corrupted here, but due to corruption, the blood was definitely slightly changed. 

So it would be the best gather as much blood as possible, then take the only demonic and corrupted part. Then, Xue Ren with his new techniques from Peler, could also gather souls for himself.