The team did some retracing of their steps to figure out the source of the shadow castles.
It was then Brandon figured it out, the vines were feeding the shadow castles from a source and he finally detected it.
"I think I was able to figure this out... this last shadow castle is the source and was cloaked...until now!"
It was then that the new shadow castle was detected... at Nightwing Manor.
"so... my dream was right about that... the final castle is.."
"back at home"
Shane had comforted Nathan as he shuddered a bit because of the dream he had.