This review is written by someone who has not read any of the books.

The movie starts with some background of chronological order in which things happen:-
1934 Dragon Corpse found
1956 Underground Palace Unearthed
1972 "Ageless" female mummy discovered
1974 Ancient fossils found in Kunlun mountain, there's an explosion, expedition sent that discovers Kunlun Shrine. Hu Ba Yi is the only survivor losing the expedition leader Professor Yang and his daughter Yang Ping.
1979 Hu Ba Yi goes to try find the Yang Ping who is back but renamed "Shirley"

The first half of this movie is about why they went to the Kunlun Shrine, what its mysteries are, why it's remained hidden all these years and what secrets are involved. Once the backstory is finally told, the second half of the movie changes into a basic survival vs. monsters (demons) movie which wasn't very interesting.

What's good - great acting by a handsome male lead as Mark Chao plays Hu Ba Yi as someone you not only can root for, but actually I'd want to be rescued by him because he is that good looking. The other actors do a credible job too. The special effects and action are top notch.

What's not so good - the second half had some exposition which was rather confusing as they kind of melded elements from Candle In the Tomb and made a right big mess of Shirley / Professor Yang's daughter Yang Ping's story, to the extent it is a mess and doesn't line up at all with the Candle In the Tomb series, or the Mojin movies. Come to think of it, I'm not even sure if this is a Mojin series movie since it doesn't actually have the word Mojin in the title.

This is more of a Creature Feature with maybe 10% tomb raiding in it, so not the best of the movies.