Perhaps a new genre of music has commenced with this release – that of monastery synth, rather than dungeon synth.  Though there is little information available on either Štefanec or Legrand, Kalamine Records provides some notes via their Bandcamp site here:

Štefanec and Legrand (Croatia) started their collaboration back in 2017.
After two years, they are releasing their first joint album Hope, for the record label HDR Limit.

In 2020, the album Pjesme iz bunkera was released for Croatian label Slušaj najglasnije publishing house.

May 1st their third joint album Eternity is released on Kalamine records.