Adelard Dekker is a recurring character who has been known to provide occasional assistance to Gertrude Robinson.
Dekker is described by Lawrence Moore as an old, thin, black man shorter than himself. He has short, grey hair and an imposing presence.
In 2006, he sends a letter to Gertrude featured in MAG 134 about his theory that a new Entity is emerging, which he dubs The Extinction. He recounts events experienced and shared with him by someone he interviewed, which he considers to be a manifestation of the Extinction.
Dekker provided Gertrude with explosives in 2008, which she used in MAG 130.
Around 2012, he helped Gertrude store a large amount of explosives, and in the note also provided a written statement which is featured in MAG 113. He was looking into a possible manifestation of The Extinction but instead discovers it to be an avatar of The End who kills people via dreams, and disables him via brain damage.
On August 14 2013, he went to Klanxbüll, Germany to investigate a possible manifestation of The Extinction in the form of a pandemic. In the process of sealing the source of the disease, John Amherst, Dekker is infected. He immediately writes an email to Gertrude Robinson in MAG 157, before presumably lighting a fire to destroy the town and dying.
Adelard Dekker has been mentioned in the following episodes. Bold marks episodes where he has given a statement.