Wormulon/ Most devastating wars

So, here is a list of the most destructive of wars in Sporewiki (bold text). I decided to throw in a few extra sci-fi wars to bulk it up a bit! They are rated by death toll, the power of the empires involved, how many worlds ravaged etc. Please say if you think I should add one.

Universal/Dimensional wars
Wars that last as long as the universe, or stretch right across it, even into others.
 * Game of Existence - War of the gods!
 * Xeelee-Photino Bird war (Xeelee Sequence) - The Xeelee (I think second only to the Xhodocto), were fighting a race of beings known as the Photino Birds, creatures of Dark Matter who live in the gravity wells of stars. The unfortunate side effect, is thats it causes stars to die.  The Xeelee fought a huge war with the Photino Birds, but it is one they couldn't win.  So they constracted a giant ring of cosmic strings that was an escape hatch.  It could manipulate the motions of the universe.  Humans believed the Ring was a weapon, and fought massive wars that lasted as long as the universe (even firing stars like bullets at the Ring), but in the end, the Xeelee sealed Earth into a pocket dimension, and locked mankind from the universe.  All except one ship, which was permitted to travel to a new universe.  In the end, the Ring was destroyed by the Photino Birds.  Although the destruction of baryonic life takes 5 million years, it was irreversable and unstoppable, however, in the Annihilation (Second Coming) survivors could still make a living post-apocalypse in small regions of the multiverse.
 * War of Ages/Second Coming - Always ends with the destruction of the Gigaquadrant or worse, a uni/universal scourge.
 * Q civil war (Star Trek) - The Q had weapons that could destroy gods and cause supernovae in our dimension.
 * Last Great Time War (Doctor Who) - A horrific war across time, where "millions died every second" and the prime weapons were paradoxes and time loops.
 * Gyronic conflict/Taldar Exodus/Extinction'''
 * Apocalypta/Thirteenth Tribe wars - Threatened reality.

Eradication wars
Wars which ended up with the extinction on various lifeforms.
 * Grox Wars combined - Gradually built up across the universe for over 6 billion years.
 * Great war of Xanthrus - All life in the galaxy was eradicated.
 * The War of Stars and Worlds (Star Maker) - Stars go to war with civilizations. The civilizations are using stars in stellar engineering, without knowing they are intelligent lifeforms (stellar engineering and moving was disrupting the astronomical dance).  The stars commited suicide by blowing up and destroying empires, which didn't guess for a long time this was suicide, and brought galactic civilisation to its knees.
 * Flood-Forerunner war (Halo)
 * Asgord Genocide + Kraw galaxy bashing - Pound for pound in relative size.

Galactic/Intergalactic Wars
The entire galaxy, larger superweapons maybe involved.
 * Borg conflicts combined (Star Trek) - Gradually built up across the Miilky Way for over 100,000 years.
 * Great Cyrannus War - Lots of destroyed planets, superweapons, ancient ringworlds, entire populations extinct or turned into Grox.
 * Galactic Civil War/Imperial invasions and conflicts (Star Wars) - An ancient Republic and Jedi order sweeped away over night. Millions of worlds conquered, less fortunate ones glassed or obliterated by superweapons.  And the Rebels didn't defeat the Empire, they remained in split form until 100 years later and reconquered the galaxy.
 * War of the Shadows (Babylon 5) - Lasted billions of years between the First Ones and both saw the manipulation of the Young Races between the ideals of the Vorlon and Shadow.
 * Clone Wars (Star Wars) - One of my favourites.
 * Yuuzhan Vong invasion (Star Wars)
 * Imperial Civil War/New Grox Wars beginning/Second Galactic War of Ottzello
 * Second War of Black Fog - Many lives lost or corrupted (!) on all sides over several politically large regions of the Milky Way, several empires devasted and a lot of demon hijinks.
 * Intergalactic War
 * DCP Civil War - The DCP almost destroyed itself and allies.
 * Ori Invasion (Stargate) - The Ori conquered the entire Milky Way galaxy in less than a month!
 * Imperial crusade combined (Warhammer) - The Horus Hersey and other wars!
 * The War for Wental - Resulted in the extinction of several member species.
 * Second Galactic War - The Rambo Nation even got conquered for a while, and Caprica was almost wiped out.
 * '''The Vartekian War
 * '''Holy Shadow War
 * Sontaran-Rutan War (Doctor Who) - A war that lasted millions of years and even involved Gallifrey (Doctor's homeworld)!
 * Asgard/Replicator war (Stargate)
 * Second Tigris War
 * Grand Galactic War
 * Girdo Galactic War
 * Mandaloran Wars (Star Wars)
 * Sith Wars (Star Wars)
 * DCP/Loron War
 * Ramvelkys War
 * Qax occupation of Earth (Xeelee Sequence) - Using Xeelee weaponry and living Spline ships miles wide, the Qax (creatures of pure chaotic systems) "bought out" Earth, quickly glassing all of Humanities colonies 5000 years from now (annd even Humans then coudn't touch the Qax), it ended when Jim Bolder sent a Xeelee Nightfighter careening into the Qax sun, they panicked and fired Xeelee Starbreakers at their own Sun. With very few Qax existing they abandoned the enslaved Humanity and evolved into quantum chaos beings.  They also attempted a backwards in time invasion.
 * Grox Resistance - The DCP's early war against the Grox. The defeat of the Grox was key to the DCP's success.
 * Human-Covenant war (Halo)
 * Lombax-Cragmites war (Ratchet and Clank)

Interstellar Wars
Either betwen smaller Tier 4 to early Tier 3 empires, such as only a few stars to several sectors of the galaxy. Some less powerful superweapons may be used.
 * '''Conflict of Vengeance
 * 10 civil wars of Xanthrus - Fought over 50,000 worlds.
 * Borg/Species 8472 war (Star Trek) - Would have evolved into something like a galactic war if Janeway hadn't stepped in.
 * Minbari-Earth War (Babylon 5) - The Minbari almost destroyed Earth, and mopped the flaw with us, however, they showed compassion in the end.
 * Dominion War (Star Trek)
 * Lequian/Zarni war
 * Hive Queen wars? (I need more info)
 * '''Trucinex War
 * Sylit-Gnosh War
 * Royal Revolution
 * Klingon-Federation War (Star Trek)

Interplanetary conflicts

 * Thousand Year War (Doctor Who) - A war between the Kaled and the Thals.
 * Human invasion of Pandora (Avatar) - Humans did beat the Na'Vi, it was Eywa who saved them.
 * War of the Worlds (the original book) - A similar scenario to above. Except Gaia did it.
 * World War Zombie (by Max Brooks)