The Adventures of Luzi Cane
Book 1: The Soul of the White Dragon
Book 2: Rider of the Crimson Dragon
Book 3: Return of the Unicorn
Book 4: The truth of the Black Dragon
Book 5: The Clarity of the Crystal Dragon
https://www.erikistrup.dk/eip6_luzi_cane_en.html
Here you'll find "Look Inside / sample" of each title