Just as the Vysil were created when the first men bathed in the burning light of an onyx dragon, Zalercrosts were created from the remains of the few plants that survived the annihilation. Zalercrosts are massive plants with a single pod in the center with tenacle like vines that stretch out from the pod. They prefer to live in damp caves but will settle for anything dark with a water source.

Zalercrosts use their poison to weaken creatures before using their psionics to take command of their minds. When they have a creature in their grasp, they use them to plant more Zalercrosts and supply the new seeds with food. 

Zalercrosts grow incredible fast, a seedling can grow to a young Zalercrost in less than one day. However, this growth requires a huge amount of food and uncommon. The alien plant eats by infecting intelligent creatures with a fungus that feeds off the host's brain and turns their body into something Zalercrosts can consume. A young Zalercrosts doesn't produce this fungus and instead needs to be planted with a large number of corpses with the fungus already in place.

As more and more Zalercrosts are planted, they naturally link together and create a network they communicate over and even share psionic power.