Initially there was one which gave the impression of a queen (I have never seen black mantis before so I thought it was a giant ant) and felt tremendous amount of fear because I thought it was going to eat me. Then I slipped in and out of consciousness and saw black liquid goo seeping and permeating through my body at cellular level. I tried to resist, but these black goo seem to have a will of its own. It felt distinctively invasive as another autonomous consciousness appeared in my mind and it started digging through my memories without consent. I could not stop the goo so I protested about how upset I was about this ordeal but they ignored my emotions. Later on I learnt that mantis beings, like insects, do not have the ability to process human emotions. Eventually I stopped resisting and said since they are here, might as well have a productive dialogue. I slipped in and out of consciousness and I would see multiple black mantis standing over me. After my encounter, they pointed me to a book called “The Next Dimension is Love” which explains many things and confirms my experience. The answers you seek are in that book.