Hydra is a mostly eliminated army in the servitude of Takhisis. They were attempting to free her from her prison at the hands of Raistlin, but failed to do so and were over time mostly wiped out because of it.
The organization structure that served to keep Hydra a concise unit is unknown, though it is likely that there was some form of direct intervention on the part of Takhisis due to the hive-mind like cooperation of the group.
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