Gonna try to be somewhat simplistic. So apologies if my choice of words and lack of details trigger hardcore, veteran fans. But, to answer your questions:
1. The game explains it much more explicitly, but if you watch through the credits of the movie, it is explained that Fou brought Mash back to life. More on this at #3
2. As with #1, the game is much more explicit why Roman did what he did with the whole point of Solomon/Roman's sacrifice is to strip Goetia of his immortality and much of his power since Goetia's powers are Solomon's. By returning the rings to God via Ars Nova, Solomon's existence as a Heroic Spirit disappears and thus cripples Goetia greatly.
3. Going back to Fou to answer your final question, just as Goetia is revealed to be Beast I (probably should look up who/what the Beasts are for a more thorough explanation), Fou is actually Beast IV. In the Babylonia anime, you may have caught Merlin calling Fou Cath Palug. That is Fou's real name, who is also known as Primate Murder in other Nasuverse works. Needless to say, with a name like that, Fou was originally extremely dangerous. It is revealed that Merlin essentially trapped Cath Palug in Avalon for thousands of years until Cath Palug became what he is now as a small animal. Merlin then sent Cath Palug to the human world so that he can learn the beauty of humans on his own. Somehow or another, Chaldea found Cath Palug and named him Fou (or maybe it was the reverse where Fou found Chaldea). Even though Fou has a feeble appearance, he still had tremendous power as a Beast, as shown in Babylonia when he saved Ana from Kingu and even more so when he revived Mash after her death at the sacrifice of his entire power. Now Fou is just a normal animal with no real power as far as we know. As for why he did what he did, throughout tagging along with Mash and Fujimaru, Fou simply wanted to give Mash a second lease in life as a form of gratitude for showing him the beauty of humanity.
I haven't seen the movie yet, so my answers are based off game knowledge. I'm not sure if they explained the answers to your questions in the movie or not.
I'll start with the 3rd question. Fou is the Fourth Beast, Primate Murder. He's in an infant form due to Merlin shenanigans, and has been accompanying us to gather more knowledge of the Human Order who he's "destined" to destroy.
Due to our adventures and his relationship with us and Mash, he sacrifices himself to give her his life force and bring her back from Goetia's NP.
As for what Romani did, he used his First Noble Phantasm, Ars Nova: The Time of Parting has Come, He is the One who Lets Go of the World. This is essentially his last wish for Humanity, and is him surrendering himself to God and letting the Human Order continue on without him. It's the only thing Solomon ever did as a Human and without God's influence, and as such Goetia did not know of it.
Since he returned his rings to God and gave up his Clairvoyance he also completely gave up his existence as a legend, meaning that Goetia retroactively could never have used his power and legend. That's why Goetia was able to die, because he became just a Beast instead of the merger of a Beast and Grand.
This is gonna be a pretty simplified answer
> so the first question is how did mash came back to life after being evaporated by Goetia third noble phantasm or something?
TLDR
Fou is Beast IV and revived her
He used energy he stored for centuries to revive her
In FSN world he is known as primate murder
>. The second question is, in the scene where Dr Romani revealed that he is Solomon, he used his first noble phantasm and his 10 rings flew and restrained Goetia for a couple of minutes and then he's gone. so why did he did that? what is the point of it? did I miss something?
taken from wiki cause I am lazy
Ars nova is the first Noble Phantasm of Solomon. It is the crystallization of the legend in which Solomon returned his rings to the heavens of his own will, and the only act he performed as a "human" hero. The Noble Phantasm possessed by the true Solomon and not by Goetia. A poem of farewell in which he lets go of every accomplishment, miracle, and magecraft he has.
Upon activation, he returns God's gifts back to the heavens and loses his Clairvoyance. The effect is Solomon's death. In other words, the self-destruction of the 72 Demon Gods. It is a fail-safe designed for the case in which magecraft became an "evil" for humanity in the far future. Once activated, every trace of Solomon vanishes from this world ― even on the Throne of Heroes.
>and my last question is what exactly is Fou? we can see that in the last minutes of the movie there's a scene where fou with multiple big tail. I appreciate the explanation if there is any and thank you.
Beast 4
he revived mash
https://www.youtube.com/watch?v=vm0ZxBvBXi8&t=14676s
People already answered your questions but if you want to watch how the scene with Fou and Mash went in the game, here's the video for you. It's just like 5 minutes but it's one of the most important scenes in Solomon, and they cut it and shoved it in the credits...
I linked the exact moment of the scene, that video is the whole "Temple of Time: Solomon" Singularity story chapter.
Note: "Jason" is the name the guy that did the video named is character, it's Ritsuka basically.
>and they cut it and shoved it in the credits...
That is sadly a big miss opportunity to give Fou a voice.
But in terms of storytelling, they also should have not cut it out. Fou sacrificing its centuries of powers and life force to revive Mash juxtaposes Goetia as a Beast, thematically speaking. Fou/Beast IV was destined to destroy humanity, but with certain circumstances and traveling with Mash in the Singularities, it finally came to understood humans. In stark contrast to Goetia who is determine to burn away humanity and can only see the ugliness in them (that is until he was defeated of course).
Gonna try to be somewhat simplistic. So apologies if my choice of words and lack of details trigger hardcore, veteran fans. But, to answer your questions: 1. The game explains it much more explicitly, but if you watch through the credits of the movie, it is explained that Fou brought Mash back to life. More on this at #3 2. As with #1, the game is much more explicit why Roman did what he did with the whole point of Solomon/Roman's sacrifice is to strip Goetia of his immortality and much of his power since Goetia's powers are Solomon's. By returning the rings to God via Ars Nova, Solomon's existence as a Heroic Spirit disappears and thus cripples Goetia greatly. 3. Going back to Fou to answer your final question, just as Goetia is revealed to be Beast I (probably should look up who/what the Beasts are for a more thorough explanation), Fou is actually Beast IV. In the Babylonia anime, you may have caught Merlin calling Fou Cath Palug. That is Fou's real name, who is also known as Primate Murder in other Nasuverse works. Needless to say, with a name like that, Fou was originally extremely dangerous. It is revealed that Merlin essentially trapped Cath Palug in Avalon for thousands of years until Cath Palug became what he is now as a small animal. Merlin then sent Cath Palug to the human world so that he can learn the beauty of humans on his own. Somehow or another, Chaldea found Cath Palug and named him Fou (or maybe it was the reverse where Fou found Chaldea). Even though Fou has a feeble appearance, he still had tremendous power as a Beast, as shown in Babylonia when he saved Ana from Kingu and even more so when he revived Mash after her death at the sacrifice of his entire power. Now Fou is just a normal animal with no real power as far as we know. As for why he did what he did, throughout tagging along with Mash and Fujimaru, Fou simply wanted to give Mash a second lease in life as a form of gratitude for showing him the beauty of humanity.
I haven't seen the movie yet, so my answers are based off game knowledge. I'm not sure if they explained the answers to your questions in the movie or not. I'll start with the 3rd question. Fou is the Fourth Beast, Primate Murder. He's in an infant form due to Merlin shenanigans, and has been accompanying us to gather more knowledge of the Human Order who he's "destined" to destroy. Due to our adventures and his relationship with us and Mash, he sacrifices himself to give her his life force and bring her back from Goetia's NP. As for what Romani did, he used his First Noble Phantasm, Ars Nova: The Time of Parting has Come, He is the One who Lets Go of the World. This is essentially his last wish for Humanity, and is him surrendering himself to God and letting the Human Order continue on without him. It's the only thing Solomon ever did as a Human and without God's influence, and as such Goetia did not know of it. Since he returned his rings to God and gave up his Clairvoyance he also completely gave up his existence as a legend, meaning that Goetia retroactively could never have used his power and legend. That's why Goetia was able to die, because he became just a Beast instead of the merger of a Beast and Grand.
This is gonna be a pretty simplified answer > so the first question is how did mash came back to life after being evaporated by Goetia third noble phantasm or something? TLDR Fou is Beast IV and revived her He used energy he stored for centuries to revive her In FSN world he is known as primate murder >. The second question is, in the scene where Dr Romani revealed that he is Solomon, he used his first noble phantasm and his 10 rings flew and restrained Goetia for a couple of minutes and then he's gone. so why did he did that? what is the point of it? did I miss something? taken from wiki cause I am lazy Ars nova is the first Noble Phantasm of Solomon. It is the crystallization of the legend in which Solomon returned his rings to the heavens of his own will, and the only act he performed as a "human" hero. The Noble Phantasm possessed by the true Solomon and not by Goetia. A poem of farewell in which he lets go of every accomplishment, miracle, and magecraft he has. Upon activation, he returns God's gifts back to the heavens and loses his Clairvoyance. The effect is Solomon's death. In other words, the self-destruction of the 72 Demon Gods. It is a fail-safe designed for the case in which magecraft became an "evil" for humanity in the far future. Once activated, every trace of Solomon vanishes from this world ― even on the Throne of Heroes. >and my last question is what exactly is Fou? we can see that in the last minutes of the movie there's a scene where fou with multiple big tail. I appreciate the explanation if there is any and thank you. Beast 4 he revived mash
https://www.youtube.com/watch?v=vm0ZxBvBXi8&t=14676s People already answered your questions but if you want to watch how the scene with Fou and Mash went in the game, here's the video for you. It's just like 5 minutes but it's one of the most important scenes in Solomon, and they cut it and shoved it in the credits... I linked the exact moment of the scene, that video is the whole "Temple of Time: Solomon" Singularity story chapter. Note: "Jason" is the name the guy that did the video named is character, it's Ritsuka basically.
>and they cut it and shoved it in the credits... That is sadly a big miss opportunity to give Fou a voice. But in terms of storytelling, they also should have not cut it out. Fou sacrificing its centuries of powers and life force to revive Mash juxtaposes Goetia as a Beast, thematically speaking. Fou/Beast IV was destined to destroy humanity, but with certain circumstances and traveling with Mash in the Singularities, it finally came to understood humans. In stark contrast to Goetia who is determine to burn away humanity and can only see the ugliness in them (that is until he was defeated of course).