A work of intense emotional scope, this piece demonstrates Goldmark's mastery of the dense, orchestral piano style prevalent in the late Romantic era. It is uniquely characterized by its sweeping harmonic shifts and dramatic, narrative structure.
Developing the stamina and control required for the thick chordal textures is the main technical hurdle.
Comparable difficulty and character — good candidates for what to learn next.
Beschwörung (Op.20) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Beschwörung (Op.20) lasts about 5 minutes.
Beschwörung (Op.20) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Allegro de concert by Aleksandr Scriabin, 'Das Geisterschiff' by Carl Tausig, Ballad No.2 by Issay Dobrowen — see the full similar-pieces list on this page.