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The '''Brainleaf'''{{Fn|1a}} (also referred to as the '''"Grey Vine"''' or '''"Slave Vine"'''){{Fn|2}} and by the scientific name ''Vinea catachanus dominari''{{Fn|3}}) is a tree native to [[Catachan]] and appears to be a small tree. It has a rudimentary animal brain with the lowest level of intelligence and appears to be able to can control animals and humans hosts through attaching its leaves to them. {{Fn|1a}}  The leaves can float away from the tree for many metres using a wing-like undulation, but when and are seemingly harmless until they come into make contact with a creatureliving body, the nerve bundles in the leaf at which point they use barbed tendrils to attach themselves and grow throughout the into their prey. The leaves then spread their tendrils into their victim's body, meshing with their nervous system. From this point on the victim becomes a mindless slave of the leaf, effectively taking them overable to perform only the most basic motor functions. {{Fn|1a}}{{Fn|3}} The Brainleaf can then make tree uses its victims to protect itself, and propagate its young. Victims have no intelligence, often lacking the motor skills to use of primitive weapons. To protect the Brainleaf, the creature '''Brainleaf Thrall''' will charge at anything that gets too close and beat it with whatever appendages it has.{{Fn|2}} The leaf is almost impossible to remove once attached. It will inhabit its abilitieshost until it wastes away, and will then look for a new home.{{Fn|3}} The Brainleaf can be removed from a host, though it is incredibly dangerous to the host. If the host isn't killed by the agonizing procedure, they will suffer permanent nerve damage.{{Fn|1a2}}

The Brainleaf uses its victims to protect itself, and propagate its young. Victims have no intelligence, often lacking the motor skills to use primitive weapons. To protect the Brainleaf, the '''Brainleaf Thrall''' will charge at anything that gets too close and beat it with whatever appendages it has.{{Fn|2}} The Brainleaf can be removed from Members of Catachan [[Astra Militarum]] regiments race through brainleaf groves as a victim, though it is incredibly dangerous to the victim. If they aren't killed by the agonizing procedure, they will suffer permanent nerve damagerite of passage. {{Fn|23}}