Lucas and the others had a vague idea about the Wild Shelters. After all, the only Wild Shelter nearby was decimated by Raze's group and a couple of Super Soldiers. Because of that, they only heard that these Wild Shelters were actually owned by Necromancers.
In short, the Shelter size itself will depend on the strength of this Necromancer… Seeing that the Necromancer in front of them could gather this many undead, they could easily tell that there must be a huge Wild Shelter nearby that they hadn't discovered.
This should be quite impossible since Sparky would always patrol the surroundings for any signs of Wild Shelters… However, there was no point being confused right now. They have to immediately take their stance.
Soon, everyone has received the information about the appearance of the Necromancer with its horde.
Mr. Wadsworth's breath was caught in his throat as he heard the identity of their enemy this time.