Brainleaf

From Lexicanum

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The Brainleaf is found 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 control animals and humans through attaching its leaves to them. The leaves can float away from the tree for many metres using a wing-like undulation, but when they come into contact with a creature, the nerve bundles in the leaf attach themselves and grow throughout the victim's nervous system, effectively taking them over. The Brainleaf can then make use of the creature and its abilities.¹

Sources

• ¹:Warhammer 40,000: Rogue Trader