The phrase "mysterious power" refers to a force or ability that is not well understood or explained, making it difficult to know how it works. Full definition
On the inside, where people tend not to know all that much about body chemistry, vitamins are regarded as an almost magical product with mysterious powers. (fitnessandpower.com)
Some of the ones who survived, however, have developed mysterious powers. (io9.gizmodo.com)
With help of Khufu - the Magical Monkey from the Underground Oasis, solve over 500 challenging puzzles spread across 7 different modes of gameplay and restore mysterious powers of ancient Egypt in this rich and original matching game. (saqqarahthegame.com)