Six legged oxygen breathing symbiote/parasite with the ability to meld itself to a wide variety of lifeforms.
Individual Melders resemble a fleshy, hairless six-legged spider about the size of a large baseline human hand. They attach themselves to the back of the skull and insert a cluster of tendrils into the brain and circulatory system of their host. At this point the Melder's internal organs begin to atrophy and are replaced by new neural tissue. When a baseline or near baseline human experiences this process they develop an enormously enhanced ability to calculate probabilities, project trends and juggle large numbers of multiple variables in their heads. A Melded Terragens may be as close as the baselines can come to mythical power of precognition. The Melder is rare and used by ai fearing subgroups and clades.
It is now known that the Melder is a biotech device constructed by an Arcadian clade, as it shows distinct similarities in cytoplasmic microstructure to other Arcadian implants and symbionts.