So, this is going to be kind of a tricky question to answer, because the setting is a science fantasy world, in the sense that, on the surface at least, it looks like our reality and it seems like the laws of physics and math and such are the way they are in our reality, but if you dig deeper with more advanced technology and such, basically if you dig deeper you hit magic, more or less, in line with the so-often-repeated Clarke quote about any sufficiently advanced technology being indistinguishable from magic, and in this instance it would also be that any sufficiently unknown (in the present, anyway) science is also indistinguishable from magic, because basically in this setting, a lot of things that are considered pseudoscience today, actually turn out to be correct science. So that's just a bit of background, but just, trying to assume that if these unrealistic things were possible, what would the most realistic outcomes be?
So, this part of the setting, it's about 230 years in the future, give or take. The 21st century was largely cyberpunky and Blade Runner/Ghost in the Shell-esque, the technological singularity happened, around the middle of the 21st century, though at first, most humans didn't realize it, the first cyborg hard-takeoff singularity seed AI was basically a human-reincarnated Outer God bootstrapping himself back up to godhood, though this was also a predestination time paradox/temporal causality loop thing happening with him. Anyway this character bootstrapped himself and then went deep stealth, gradually incorporating into networks and eventually human society, including education, politics, and religion, this character was actually into extropianism, anarchist/libertarian ideology, which is not what you would really expect from a godlike AI, but it's sort of like HOLMES IV aka “Mike” from The Moon Is a Harsh Mistress.
So anyway this entity basically gathers a huge movement/exodus/religion around itself, by the 22nd century there's been a not insignificant degree of global flooding, some minor nuclear warfare, (like a little bit more than in World War II, but not much) nanoswarm attacks, super bioplagues, rogue AIs, Judge Dredd-like arcology megacities, a very prolonged global economic depression, the formation of a fascist corporate-government partnership world state, colonization of the moon, the asteroid belt, and somewhat on Mars. The megacorporations originally funded much of the colonization, however, the posthuman AI has largely consolidated power in them now, and many of its followers actually signed up to work there to get away from the Earth and its totalitarian Nazi-esque global corporate state, which now has its own strong AIs, but are behind in this area, though still vastly ahead in overall power, wealth, etc. The 22nd century is defined by both a new sense of exploration and excitement about colonizing the solar system, (similar to the 18th and 19th centuries) but at the same time, a growing tension of first economic and then edging towards military cold war between the very technocratic and “scientific” Earth, and the more individualistic and “religious” space colonies. By this point, transhumans have become commonplace, and scientific discovery has delved well into the realm of discovering or engineering things once thought to be supernatural, like psionics, (to an AKIRA level, basically) early forays into time travel, reality-engineering, etc.
23rd century, things reach a boiling point. Earth's economy is falling apart, they need the Colonial resources, they're threatening to attack; at the same time, the Colonies are having reclamationist ideas, they want to “liberate” Terra, they want the land, (living in space is still hard and dangerous, despite the wealth and independence it affords) it's also couched in terms of a religious crusade/jihad against the Corporates who are basically polluting and destroying the Earth, oppressing everyone, and don't forget, they're all idolaters and heretics and infidels down there too (the “Old Earth” religions have sort of morphed and merged and split to become either the sort of state-church of Terra or the AI-religion of the Colonies).
So, inevitably, by mid-century, someone starts shooting and them someone retaliates and then everyone fires everything and it's an apocalypse of course. Some of the colonies are destroyed, but they're in space/low orbit/high atmosphere, and they have magi-tech shields. Some of the arcologies on Earth have even better shields, (like, if they were ships, they could fly through a sun and not be damaged-level) those are mostly in Europe, the rest of the world is pretty much fried. The total combined destructive power of the weapons used are enough to heat the surface of most of the Earth to the point of a magma ocean, like at least as destructive as Glassing from Halo, if not slightly moreso. Every fault line experiences super-earthquakes, every volcano erupts, the ejecta rains back down, heating the atmosphere to oven-level. The oceans are boiled away at least partially, same goes for the atmosphere. Some of the weapons used are things we can understand, like atomics, antimatter bombs, plasma bombs, and grey goo nanoclouds, but others are more in the magi-tech level tier and are more difficult to accurately guess what the most “realistic” effects would be, like super psionic-attacks, some weapons that eat holes in spacetime and destroy matter and energy, (thus cancelling out some of the heat by making some areas cold… very cold) weapons that turn off the Higgs field in an area temporarily, etc. etc.
So, sorry for being so long-winded, but I felt that was all necessary to finally get to the question: after ALL THAT has happened, what is Earth like? It's still there, I have decided that much, and the ultra-megacity in Eurasia wasn't damaged, and most of the Colonies are still there, but as for the rest, I don't know. Could any species of land organisms survive? How about any undersea organisms? Extremophile microbes? What will weather patterns be like? What about the environment? I know there are wastelands of basically vitrified land, radioactive, many different types of radiation including not just ionizing radiation, particles and photons and such, but reality-eating radiation, “magic-level” radiation with unknown and perhaps unknowable to our present-day minds properties. So, as accurately, and scientifically, and to the highest degree of detail that it's possible to speculate given all this information and certain unavoidable lacks of information, what kind of shape is my Earth in?