Seven that spell is a very cool psychedelic rock band from Zagreb (Croatia).
They describe themselves like that in their Bandcamp page : "Modern, aggressive psychedelic wall of sound incorporating polymetrics and occasional Viking funeral rites; hailing from the 23rd century where rock is dead, Seven That Spells returned in time where its still possible to change the tragic course of the boring history."
I can't hear the viking funeral rites (but I'm not very well versed in viking funeral rites I must confess) but the rest is indeed a good description.
They are very active, touring and recording a lot (but not yet in France, damn!), some of their records, like the last one, The death and resurection of Krautrock : AUM (first part of a Death and resurection of Krautrock trilogy), are very guitar oriented and rocking. Listen to it on their Bandcamp.
some of their previous records are more progressive (but always energic), with saxophone parts, like the really good Future retro spasm. that you can listen to on their Bandcamp.
but they also tried with some vocals like on Acid taking and sweet love making, and other things.
here's a video of Seven that spells performing AUM from their last record released.
If you want to buy their records, see what their tour schedule is, check the news, etc, here's the official site of Seven that spells.
Their guitarist Niko told me they don't do written interview no more (prefering meeting people for real, which I can absolutely understand), but he kindly gave me links to some interviews he already had done, so here it is (it's interesting and the guy has a good rock'n'roll attitude!) :