MC is special and has TWO spirits, one from original Lin Feng (Celestial Fang) and one from Reincarnated Lin Feng (Celestial Book Spirit). The book spirit is the stronger of the two and straight forward, every page has an ability and as he opens a new page he gets a new ability - this kind of spirit is extremely rare and top 3 of all spirits. He has only opened first page so far and gained the "Dark Eyes" ability.
The second spirit appears to be a snake spirit but actually can evolve by swallowing either qi, beasts or other spirits. It currently is an Ice spirit after absorbing Meng Qing's frost qi. Its true form will be seen much later.
The true form of Celestial Fang is a multi-headed dragon - the more heads the dragon has the stronger it is. Max heads is 9. Lin Feng original has 6 but his dragon can gain heads and he'll absorb other people's spirits for the new heads.
so he got his spirit ( the dark thing) and former body owner spirit ( the swallowing snake), but everytime the snake devour spirit it got merged with his dark spirit and now the snake devour frost qi so his dark spirit turn into frost spirit?
I'm not sure how manga will do it but it follows the LN pretty closely. The dark spirit is actually a dark book spirit with multiple pages and the dark monster is actually from first page of that book - the speciality of that monster is enormous perception hence it manifests best in his eyes.
The snake is a devouring snake as you have said and eats qi/ beasts/ spirits to gain those abilities.
I only picked up the LN from chapter 100 onward but Twin spirits do not merge but that does not mean he cannot use two spirits at same time just that I don't ever recalling a frost dark hybrid spirit. As he opens more pages of the book spirit things will become much clearer that the two spirits are completely different.
The confusing part may be the manhua is making a bigger issue of the Dark Monster spirit (probably because it looks much cooler graphically) and implying its separate from the snake or book spirit but there is/ was no third spirit and even in the first chapter he stated he only has 2 spirits. The only place this dark spirit can come from is the dark eyes ability of the first page of the celestial book spirit which was introduced in chapter 23 of the manhua - both in LN and manhua it is clearly stated the dark spirit awakened into the book spirit.
Snake becomes a multi-headed dragon and dark spirit is a book with pages with a variety of abilities. See wiki for more detailed spoilers.
@Fi_786
I believe he (@Solemmaru) misinterpreted the Illusion Demon Beast, which was absorbed by the"Heavenly Devourer", as the Celestial Book Spirit, from which the Dark Spirit (The shadow humanoid) comes from.
This currently makes him hold 3 spirits. Snake, Book, and- from what can be gleamed- a commissioned spirit that changes based on the last devoured spirit/qi/beast. Which was a ghostly direwolf, and is now currently an ice gorilla/humanoid.
The third one you talk about, the devouring is being done by the "snake" spirit. When the snake spirit devours it takes up that ability even now if you look at the images in this chapter the purple snake is clearly shown and the frost giant is simply its manifestation. The wolf before was also the snakes manifestations but has now been replaced. The snake spirit will evolve later but at the moment it can only have one manifestation. So you can't really separate the snake and the ice spirit he has now as two different spirits because the former is the latter. Hope that makes sense.
I see what you're saying, the manhua is portraying the devour ability of the snake spirit as the extra manifestation of a spirit whilst in the LN it was a part of the snake spirit and not separated into a 3rd spirit.
Kinda weird because the snake spirit becomes a 6 headed dragon spirit and each new head will have new abilities thus will not need the third spirit method they have used here. So it will be interesting to see how they handle this "third" spirit which effectively disappears/ dies.
@Fi_786
It may even be a visual representation of the currently held spirit
or, as you've said, extra head
, as iirc, the third spirit has done nothing more than boost Lei Feng's power in some reguard. The Illusion Demon Beast only raising him to Second Soul Layer.
Though I may be mistaken. As Lei Feng has shown signs of illusion type martial arts since IDB's emancipation, through the powers of the Dark Spirit/Celestial Book. That may just be coensidence...
It's yet to be seen if Ice Gorilla will influence anything besides a new boost in needed strength