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Gathering coils were engineered biotech weapons, described as a "semi-species" by the Thirteenth Doctor.
Characteristics
These coils resembled cables and wires of various sizes, acting like tentacles, which could gather data. At least some coils also had the ability to plant DNA bombs. A number of Gathering coils were able to gather to create one large, more polyvalent creature, though such a swarm could be deactivated with a large electric shock. (PROSE: Things She Thought While Falling, TV: The Woman Who Fell to Earth)
History
Tzim-Sha used one such swarm in order to locate a trophy to take back to his planet, despite this being against his species' rules. It was later deactivated by Grace O'Brien, who electrocuted it with a cable at the cost of her life. (TV: The Woman Who Fell to Earth)
Undated
One of these Gathering Coils was housed within the prison the Thirteenth Doctor found herself imprisoned in by the Judoon. This Gathering Coil is to the right of the Sycorax the Thirteenth Doctor nicknamed "Clyde". We only see it when the view of the prison is from above, and we see it's electrical energy. (TV: Revolution of the Daleks)