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|Place of origin:||Pre-universe|
|Main voice actor:||Maggie O'Neill|
Derleth was an Elder God that could control people's emotions. He had purple blood.
The Seventh Doctor had located him in Romania in 2015. The Forge had tried to take the Truthsayer from the Ukranian government, but Lysandra Aristedes stopped the train on the Doctor's orders. When the train containing him crashed, he possessed Lysandra, and made Sally Morgan worship him. He then tried to possess the Doctor and half succeeded before Lysandra used the truth sayer on him, suppressing him from the younger Lysandra's mind, keeping him in her mind. (AUDIO: Project: Nirvana)