It's used to summon spirits. A musical incantation. Or have a read through this for a better answer https://digital.library.unt.edu/ark:/67531/metadc407854/m2/1/high_res_d/dissertation.pdf
No 1 and 3 just bite into your ears and have a wonderful effect, no 2 is much more subdued and not near the quality of the ones surrounding it imho. No 3 repeated chords and melodic lines are just so orgasmic and No 1 use of 9ths are very memorable. I overall find his Sonatas very diffficult to contain and make understandable for general listeners, it is just too over the top and lengthy. With his etudes you can present his musical language and contain it for the general listener, their curiosity can be held for that time but I feel the Sonatas simply lose a lot of people because it can sound like musical ramblings which go on and on.