Hate, who formed in Warsaw in 1990, have been hailed as a "hallmark of consistency," and praised as a "sleek and tight death metal monster." Since 2017's Tremendum, Hate has focused on nature and it's mysteries as a main source of inspiration. For instance, 2019's Auric Gates of Veles focused on death, the Slavic perception of death in particular. Six years later, Bellum Regiis finds Hate delving into "humanity and why are we, as creatures, so deeply motivated by concepts like power, wealth, glory and faith. The main theme is a struggle for power and everything that comes with it." Hence the album title Bellum Regiis, which translates to "A War of Royalty" or "A War of Kings."