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Tainted Spawn of Hydross can be found in Serpentshrine Cavern.
When Hydross the Unstable changes to his poison form, he will spawn 4 Tainted Spawn of Hydross, which you can crowd control. Kill these adds as fast as possible, you only have one minute before you will need to change Hydross the Unstable's vulnerability again. Make sure you don't banish too many of them or you will have to wait before you can kill them.