No matter who lives or dies, there are the worm gods. For those unaware, essentially these guys were at god like level before they made the symbiosis with aurash, sathona, and xi ro. And that was tens of thousands of years ago. And any time any hive (no matter how weak or strong) kills something, it tithes this power back to savathun, oryx, and xivu arath. Which then goes to the worm gods, making even more powerful every second. And mind you, the hive have conquered countless of systems and perhaps even galaxies for literally over 20,000 years. So the worm gods themselves... Yeah... That would be a problem. And let's not forget oryx can take any entity so long as they are alive and have a will (so that would mean flood and even forerunners) Then there are the vex. Granted, most of their ontological power comes the vault and etc. So yes, if any fight was between them and something else OUTSIDE the vault, garden, and other places, their ontological abilities are drastically weakened. And yes they are organic beings (the radiolarians in their chest) so they can be effected by the flood. However, the time and gatelords (such as quria, quodron, over minds, sekrion, theyosion, and others) all still have very powerful ontological capabilities. So while they can't make something or someone never exist if the battle isn't in one of their controlled dimensions; they can still take something completely out of existence instantly The fallen and cabal could fight, but ... Meh. Now if the cabal brings their entire empire, there will be fireworks (they decimate planets and moons for getting in their way). And if all fallen houses ban together, they have some good numbers. Not to mention that for some... Reason... Some of them know how to control vex time gates and can bring more reinforcements. Then there is the nine. I believe we shouldn't allow them in this fight since their power is immeasurable. But if we do, we at least know they can fabricate and issue out the greatest weapons the guardian arsenal has seen. And they are capable of incarcerating entire cabal fleets, vex time lords, and hive abominations. Next up will be guardians. There are specific names: Kabr: made himself the aegis and could not be completely erased even in the vault Saint-14: caved in a kell's skull with a singular headbutt Thalor: his nickname was "the impenetrable" or something like that Shaxx: was capable of holding an entire wall against countless fallen fleets during twilight gap Shin malphur: the only guardian who has never died. Jaren ward: original wielder of tlw The six coyotes: kept safe hundreds of human outpost against fallen fleets... You know, only six of them Effridiet (spelling): every time she fired her weapon, an enemy of the city died Pahanin errata: fabricated the SGA and was the only guardian from kabr's firetam to survive the vault (technically) Ana bray: her light burned so bright she was capable of making pools of light to strength her brother and sister guardians Tevis: first hunter to wield void energy. Perhaps one the oldest and deadliest guardians (the only reason he died is due to the fact he became to cocky) Eris: survived the darkness of hive for who knows how long. She is the only entity EVER to succeed at this feat. Albios: used five lives to track down and kill ahamkara alone Lyssa the light hearted: literally capable of breaking fundamental laws such as gravity Eriana-3: last of the praxic fire. Killed hundreds of hive before dying herself. (And this was when she was being over run by every angle) Ikora: survived the frontier alone longer than any. And killed any that stepped in her path Praedyth: became an anomaly so perplexing that no vex could completely erase him. And unlike kabr, he didn't lose his mind in the process. Osiris: can melt any enemies with his understanding of the sun. Toland: can travel through dimensions, understands sword logic better than any. Has fully embraced the void Ulan-tan: understands the void better than any The awoken have harbingers (essentially sentient void flavored faster and more deadly death star lasers) Then their is of course the ahamkara. That can you know, EAT REALITY WHOLE I'm not even sure if a spartan could kill guardian. Don't get me wrong, Spartans are WAY more skilled and experienced than guardians. However they wouldn't be capable of killing their ghosts (so they could just continue to be revived/respawned) And if a super is activated, it doesn't matter; no matter what armor the spartan is wearing, no matter what defenses they have, it can't save them from being smashed, hacked, or palapatined into oblivion, shot, hammered, or scorched into ashes, or dusk bowed, smashed by a collapsing star into nothingness Even with an array; guardians are already dead (so are the hive). So all they'd be killing is the fallen, cabal, regular humans, vex, and awoken. Along with all of their own armies and fleets excluding ai, etc. The hive, taken, guardians, and ahamkara, (possibly the nine) would all be fine. [spoiler]and if worse comes to worse, the ahamkara could get bored and eat all existence in that reality[/spoiler] So yeah destiny wins