[6] Červenák's early works, published under the pseudonym 'Thorleif Larssen', were moderately successful with readers but largely dismissed by critics as derivative of his literary influences (most notably Howard) and lacking in inventiveness and sophistication.

[8] The short story introduced a new protagonist, Rogan the Warlock, along with his wolf-demon companion, Goryvlad, in an original world of high fantasy based on Slavic history and mythology.

Červenák then moved on to a historical fantasy trilogy based on Bylinas; the first novel, Bohatier: Oceľové žezlo (Bogatyr: The Iron Scepter), describing the exploits of the legendary hero Ilya Muromets was published in 2007, followed by two sequels in 2007 and 2008.

In 2009, Červenák wrote Strážcovia Varadína (The Guardians of Oradea), the first in a series of historical adventure novels following the exploits of the fictional captain Kornélius Báthory in the late 17th century, against the backdrop of the various conflicts between the Ottoman empire and the Habsburgs.

This trend was further cemented by a series of historical mystery novels,[14] featuring a pair of fictional detectives, Joachim Stein and Matej Barbarič, on a quest to solve crimes in the late 16th/early 17th century Habsburg Empire under special orders from Archduke Matthias of Austria.