Collecting treasures…

Mandrake root :

noun  man·drake  \ ˈman-ˌdrāk \
Mediterranean herb of the nightshade family with a large root resembling a human in form and credited with magical properties…

Spell
noun

A word, phrase, or form of words supposed to have magic power; charm; incantation; 
a state or period of enchantment; any dominating or irresistible influence; fascination.
First recorded before 900; Middle English spel ,Old High German spel, Old Norse spjall.

Spellbook:

noun

Book of magic containing the witch’s curses…

Mystery

Anything that is kept secret or remains unexplained or unknown: any affair, thing, or person that presents features or qualities so obscure as to arouse curiosity or speculation, any truth that is unknowable except by divine revelation.

1275–1325; Middle English mystērium mystḗrion, equivalent to mýstēs + -tērion