Psychic pollen
From Tardis Wiki, the free Doctor Who reference
Psychic Pollen is an entity that feeds on your dark side. The entity then turns the your dark side against you and lets it attack you.
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Technology
The Dream Lord could create various types of dreams and manipulate them, including an army of pensioners and a sun burning ice. This pollen was disposed of through the TARDIS doors into space (DW: Amy's Choice).
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to be added