Vers la flamme is an atonal tone poem that depicts an increasing intensity leading to a final, blinding conflagration. It is distinctive for its repetitive, hypnotic patterns that gradually coalesce into an overwhelming, dense wall of sound.
The pianist must carefully manage the acceleration of dynamics and texture to build the massive, inescapable climax.
Comparable difficulty and character — good candidates for what to learn next.
Vers la flamme (Op. 72) is rated Henle level 9 of 9 — virtuoso repertoire, roughly concert / virtuoso level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 9 — meaning you can already play level 8–9 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 Vers la flamme (Op. 72) lasts about 6 minutes.
Vers la flamme (Op. 72) 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 Étude in D-sharp minor, No. 12 by Aleksandr Scriabin, Piano Sonata No. 4 in F-sharp major by Aleksandr Scriabin, Ballade No.2 by Franz Liszt — see the full similar-pieces list on this page.