During the boss fight, if any whistles have been collected, the character can crouch in the far left corner of the screen to use a whistle to summon a familiar.
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Wilby's first published academic text, Cunning Folk and Familiar Spirits: Shamanistic Visionary Traditions in Early Modern British Witchcraft and Magic (2005), was the first major examination of the role that familiar spirits played in Britain during the Early Modern period, and compared similarities between the recorded visions and encounters with such spirits, with shamanism in tribal societies.
He took the witch-name of Krix and was provided with a familiar named Füchsin ("Vixen"), at which point several local townsfolk revealed themselves as similarly allied with Satan and congratulated him.