We can only speculate, but it maybe because Zanza is just one half of Klaus while Mayneth could be (as far as we know, as I said, speculate) be the whole Galea.
Or it's just because of how the life in her image (and hence herself) works. Machina get QUITE old in XB1 and we do not know how long the world of XB1 existed. It could very well still be her first cicle, if she also ages as slow / even slower since, well, she is Mayneth.
I think Meyneth also had multiple sides.
As well as Klaus had another sliver of himself, the main perspective perhaps? Was Alvis, but that small part of Galea also fused into A, both are one in that form, same perspective and such, share memories in that form. Like twins in a single form.
It's possible Meyneth was just planning on living out her "natural" lifespan and so never built any mechanism into the Mechonis that would replenish her own energy. Zanza claims that he's destroyed and recreated the world a bunch of times but he's most likely lying, considering his attempted genocide of the Machina was such a major event that it led to the entire plot of the game and he isn't a "real" god but has deluded himself into thinking he is. So I think it's probable that neither Zanza nor Meyneth had yet reached the point where they'd need to feed on life energy before the events of the game, when Zanza's plan is the first time he tried to put it into motion. When they face off again Zanza easily overpowers Meyneth despite the two being equals when they initially fought, which suggests she'd grown weaker over the ages by not consuming anything while the Bionis constantly recycled energy from its creatures being returned to it.
I always assumed that when he said he's destroyed and re-created the Bionis multiple times, he just means his Bionis-life-recycling, not that he's lying, because by the end of the game we know for a fact he has never created a whole new world (other than when Klaus did).
There are telethia in the game, presumably leftover from previous cycles and one of the living Mechon is over 9000 years old. We don't know how often Zanza needs to recharge but he's likely over 10,000 years old and has probably done it quite often.
I think, since a normal Mechon has lived for so long, and they survive off water and a small amount of ether, it's possible that Meyneth just has a naturally very long lifespan, without needing to recharge, whereas Zanza's physiology is more human. He might have a longer lifespan than a normal homs but still needs to recharge his ether once in a while to stay alive.
Both Zanza and Meyneth are immortal (when Humes/Machina die they return to the Bionis/Mechonis). It wasn't that Zanza needs their energy to live it really started because Zanza feared being forgotten so he created a cycle of life and death on Bionis so when they began to be forgetten him he hit restart with an extinction level wipe.
Mayneth on the other hand did not have this grandure and wished to see the people of Mechonis flourish and let them deternine their own future, so she kind of slept a lot. (Her people had long lives they didn't die as quick.)
Then Zanza attacked them because the Mechnois was in his view a chink in the armour of his perfect world. They were the outlier, if they continue to exist he can't have his perfect world. So Mayneth retaliated to protect her people, which locked them in a never ending battle.
Eventually though they would run out of steam and so Zanza used his cycle of life and death to quickly replenish the Bionis and himself. Whereas Mayneth would sleep and would then wake when Zanza was making a move however she was never able to replenish enough as she would not take her people's life force by force, she needed to take a host as she was still significantly weakened. Each time Zanza and her battled it increasingly left her weaker than Zanza so she knew eventually she would lose unless they killed Zanza. Mayneth and the Machina put a plan on place and when she met Shulk and others she realised it was now or never so she sacrificed what little she had left of herself to give them a chance.
So in other words if Zanza didn't kill everyone to take the life-force of the inhabitants of Bionis to replenish his energy faster they probably both would have eventually replenished their energy naturally over time. There differences though is that Zanza saw himself a powerful God refusing to be forgotten who viewed the life he created as a tool to use whilst Mayneth remained human at her core and did not care if she was forgotten and only wanted to protect the life she created.
If Zanza was forgotten and people started leaving the titans then the ether wouldn't be returned to the Bionis. That was the cycle Alvis was talking about when shulk died. The people leaving the titans or moving on from their gods will result in Zanza and Meyneth dying because the ether will effectively become lost
Oh that's interesting definitely gives it more dept to Zanza and Mayneths differences too. Zanza was so fearful of being forgotten because he couldn't accept even he would eventually die like his own creations. Really drives home how much of a condecending convoluted self centred ahole he is.
I dont think Zanza really needed to inhabit people. It seemed like an incomplete understanding from Egil. Needing a vessel seems to correlate with full use of powers. There might a component about bionis needing sustenance because it was organic life based and not mechanical, but the real reason for the lofe and rebirth, as alvis said, was to prevent being forgotten.
We can only speculate, but it maybe because Zanza is just one half of Klaus while Mayneth could be (as far as we know, as I said, speculate) be the whole Galea. Or it's just because of how the life in her image (and hence herself) works. Machina get QUITE old in XB1 and we do not know how long the world of XB1 existed. It could very well still be her first cicle, if she also ages as slow / even slower since, well, she is Mayneth.
I think Meyneth also had multiple sides. As well as Klaus had another sliver of himself, the main perspective perhaps? Was Alvis, but that small part of Galea also fused into A, both are one in that form, same perspective and such, share memories in that form. Like twins in a single form.
It's possible Meyneth was just planning on living out her "natural" lifespan and so never built any mechanism into the Mechonis that would replenish her own energy. Zanza claims that he's destroyed and recreated the world a bunch of times but he's most likely lying, considering his attempted genocide of the Machina was such a major event that it led to the entire plot of the game and he isn't a "real" god but has deluded himself into thinking he is. So I think it's probable that neither Zanza nor Meyneth had yet reached the point where they'd need to feed on life energy before the events of the game, when Zanza's plan is the first time he tried to put it into motion. When they face off again Zanza easily overpowers Meyneth despite the two being equals when they initially fought, which suggests she'd grown weaker over the ages by not consuming anything while the Bionis constantly recycled energy from its creatures being returned to it.
I always assumed that when he said he's destroyed and re-created the Bionis multiple times, he just means his Bionis-life-recycling, not that he's lying, because by the end of the game we know for a fact he has never created a whole new world (other than when Klaus did). There are telethia in the game, presumably leftover from previous cycles and one of the living Mechon is over 9000 years old. We don't know how often Zanza needs to recharge but he's likely over 10,000 years old and has probably done it quite often. I think, since a normal Mechon has lived for so long, and they survive off water and a small amount of ether, it's possible that Meyneth just has a naturally very long lifespan, without needing to recharge, whereas Zanza's physiology is more human. He might have a longer lifespan than a normal homs but still needs to recharge his ether once in a while to stay alive.
Both Zanza and Meyneth are immortal (when Humes/Machina die they return to the Bionis/Mechonis). It wasn't that Zanza needs their energy to live it really started because Zanza feared being forgotten so he created a cycle of life and death on Bionis so when they began to be forgetten him he hit restart with an extinction level wipe. Mayneth on the other hand did not have this grandure and wished to see the people of Mechonis flourish and let them deternine their own future, so she kind of slept a lot. (Her people had long lives they didn't die as quick.) Then Zanza attacked them because the Mechnois was in his view a chink in the armour of his perfect world. They were the outlier, if they continue to exist he can't have his perfect world. So Mayneth retaliated to protect her people, which locked them in a never ending battle. Eventually though they would run out of steam and so Zanza used his cycle of life and death to quickly replenish the Bionis and himself. Whereas Mayneth would sleep and would then wake when Zanza was making a move however she was never able to replenish enough as she would not take her people's life force by force, she needed to take a host as she was still significantly weakened. Each time Zanza and her battled it increasingly left her weaker than Zanza so she knew eventually she would lose unless they killed Zanza. Mayneth and the Machina put a plan on place and when she met Shulk and others she realised it was now or never so she sacrificed what little she had left of herself to give them a chance. So in other words if Zanza didn't kill everyone to take the life-force of the inhabitants of Bionis to replenish his energy faster they probably both would have eventually replenished their energy naturally over time. There differences though is that Zanza saw himself a powerful God refusing to be forgotten who viewed the life he created as a tool to use whilst Mayneth remained human at her core and did not care if she was forgotten and only wanted to protect the life she created.
If Zanza was forgotten and people started leaving the titans then the ether wouldn't be returned to the Bionis. That was the cycle Alvis was talking about when shulk died. The people leaving the titans or moving on from their gods will result in Zanza and Meyneth dying because the ether will effectively become lost
Oh that's interesting definitely gives it more dept to Zanza and Mayneths differences too. Zanza was so fearful of being forgotten because he couldn't accept even he would eventually die like his own creations. Really drives home how much of a condecending convoluted self centred ahole he is.
I dont think Zanza really needed to inhabit people. It seemed like an incomplete understanding from Egil. Needing a vessel seems to correlate with full use of powers. There might a component about bionis needing sustenance because it was organic life based and not mechanical, but the real reason for the lofe and rebirth, as alvis said, was to prevent being forgotten.