alchemystical

The story

1. Proto-Indo-European*ǵʰew-
2. Ancient Greekχῠ́μᾰ (khŭ́mă)
3. Ancient Greekχυμείᾱ (khumeíā)
4. Arabicالْكِيمِيَاء (al-kīmiyāʔ)
5. Latinalchēmīa
6. Medieval Latinalchēmista
7. Old Frenchalquemiste
8. Englishalchemist
9. Proto-Indo-European*h₂el-
10. Proto-Indo-European*h₂élisder.?
11. Englishalchemistical
12. Proto-Indo-European*mewH-
13. Proto-Indo-European*mewH-ye-
14. Ancient Greekμῡ́ω (mū́ō)
15. Ancient Greekμῠέω (mŭéō)
16. Ancient Greekμῠ́στης (mŭ́stēs)
17. Ancient Greekμῠστῐκός (mŭstĭkós)
18. Latinmysticus
19. Old Frenchmistique
20. Englishmystic
21. Englishmystical
22. English todayalchemystical

Variant of alchemistical, perhaps with intentional blend of mystical.