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The planet is covered in huge domed cities, producing vast amounts of food that support other planets and the Ultramarines. They also make use of as much moisture as they can get out of the parched planet, setting up large water traps.
Tarentus is part of a group of three agri-systems, along with Quintarn and Masali, known collectively as the "Three Planets". Just after the Battle of Macragge, a group of Ork scavengers arrived on the 'Three Planets' and proceeded to conquer them. Marneus Calgar led the Ultramarines to reconquer these planets for the good of Ultramar.
During the Invasion of Ultramar in 854999.M41, Tarentus was the first planet attacked by M'kar the Reborn, who summoned hordes of daemons that appeared within the dome cities and massacred the population.[2a] The daemons were eventually cleansed from Ultramar.[2b]