A {{Crossover}} FusionFic of Halo and Warhammer 40k written by Fan-Fiction author AzureSpider, "The Hammer and the Rings" features a universe that is Halo and Warhammer merged into one, leading to a world in which the Covenant aliens are servants of the Four Powers and the humans and Eldar have an EnemyMine against them. The crossover features many altered versions of actual Halo stories, and due to the author's admitted limited knowledge of the Warhammer 40k universe he plays fast and loose with the canon of the Grim-Dark world, [[RuleOfCool though the story itself is still pretty good for what it is]].

The Fan-Fiction can be read here: http://www.fanfiction.net/s/8929016/1/The-Hammer-and-the-Rings. The author has also written the fan-fiction "Spider-Man Downfall", a page on which can be found here: http://tvtropes.org/pmwiki/pmwiki.php/FanFic/SpiderManDownfall
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!!This story contains examples of:

* AdaptationalHeroism: The Eldar, who though still possessing ManipulativeBastard tendencies and some FantasticRacism towards the humans, are not guilty of the same atrocities their mainstream counterparts are.
** In particular Eldrad Ulthran never caused an Ork Warboss who killed a billion humans to come to power here.
** The Imperium of Man also due to being fused with the UNSC
* AdaptationalVillainy: The Insurrectionists, who were already pretty bad but here become this world's ''Chaos Space Marines'' after willingly joining the Four Powers.
* AffablyEvil: Sindri is unfailingly polite at all times.
* AlternateContinuity / AlternateUniverse: Or more accurately, a fused together universe.
* AlwaysChaoticEvil: Every race except the humans and non-Dark Eldar
* AxCrazy: The Arbiter, Lord Bale, and all of the servants of Khorne
* {{Badass}}: Plenty to go around naturally.
* BadassArmy: All of them
* BadassCrew: The Human's Admiralty Board, who consist of the leaders of the different Space Marine chapters.
* BadassNormal: The ODSTs and Hastati Squad
* BigBadDuumvirate / BiggerBad: The Four Powers
* BladeOnAStick: Endewan uses a polearm as well as a shuriken pistol and sword.
* BrightIsNotGood: The servants of Tzeentch, who wear sky blue and [[RealMenWear pink]]. Averted with the colorful humans and Eldar though.
* CanonForeigner: The Elder One, Endewan, Donald, Captain (later Colonel) Dawson, and Alexander
* CanonImmigrant: Quite a few different characters from various corners of Halo show up in this story, as well as several characters from Warhammer Dawn of War (Sindri, Bale, and Macha).
* {{Catchphrase}} / BattleCry: "Blood for the Blood God! Skulls for the Skull Throne!"
* ChainsawGood: The Chaos Space Marines here retain their chainsaw swords though also seem to be the only humans that do.
* CoDragons: Sindri and the Arbiter to Lord Bale.
* CoolHelmet: A couple different ones but the Eldar and Chaos Space Marine helmets tend to be the coolest of them all.
* CoolSword: The Witchblades and Chainsaw Swords of course.
* CrapsackWorld: The original Warhammer 40k universe, hence why the Elder One fused it with the Halo Universe.
* DarkIsEvil: The servants of Chaos Undivided (including the Chaos Space Marines) wear black armor.
* DeadpanSnarker: [[WorldOfSnark Quite a few different characters have their moments]]
* DeathByAdaptation: [[spoiler: Thomas Lasky, who here dies in place of Chyler Silva during the Covenant's attack on Corbulo]]
* DyingRace: The Eldar
* TheEmpire: The Covenant and the UNIM (United Nations Imperium Of Man).
* EnemyMine: The Humans and Eldar against the Covenant and Four Powers, though they're not really enemies.
* FantasyPantheon: The Four Powers are a villainous example.
* FireBreathingWeapon: Here the Hunter's cannons shoot Eldritch Flames instead of Fuel Rod blasts due to their devotion to Tzeentch.
* [[spoiler: {{Foreshadowing}}: Chapter 7 features what Eldrad identifies as disintegration weapons, suggesting the Necrons. Lo and behold, the Necrons do indeed show up soon after.]]
* FusionFic
* {{God}}: The Elder One
* GodOfEvil / {{Satan}}: The Four Powers
* GoodIsNotNice: The Eldar, who don't think highly of humanity and don't even try to hide or moderate their racist opinions of them. But at the same time the Eldar are also [[JerkWithAHeartOfGold working tirelessly to stop the Four Powers and the Covenant]].
* HelmetsAreHardlyHeroic: Inverted by and large. The humans and Eldar mostly wear full-face covering helmets in battle while the only villains to wear helmets are the Elites, Chaos Space Marines, and Dark Eldar.
* HopelessWar: What the Eldar's war with the Covenant is starting to look like, hence why they form an alliance with humanity.
* HumansAreWarriors: Especially the Chaos Space Marines
* InterserviceRivalry: Between the servants of the different Four Powers. Also mildly between the humans and Eldar.
* {{Jerkass}} / JerkWithAHeartOfGold: The Eldar bounce back and forth between these two constantly.
* KnightInSourArmor: Quite a few of the humans are this, especially the Admiralty Board.
* LighterAndSofter: Invoked in-universe. The Elder One fused the Warhammer 40k world with the Halo universe precisely so a better world could be created. Though in the case of the Halo half, this fan-fiction's tone is pretty on point.
* [[spoiler: TheMole: According to Sindri, he has a spy on the inside]].
* {{Mooks}} / CannonFodder: The Grunts, Drones, and Pink Horrors.
* NobleBigot: The Eldar
* OffWithHisHead
* OurDemonsAreDifferent: The Four Powers and their minions of course.
* PlayingWithFire: The Lord of Change, TechnicolorFire to be exact.
* PragmaticVillainy: Sindri
* {{Precursors}}: The Forerunners
* PsychicPowers: Many of the Eldar have these, with the Farseers and in particular Eldrad Ulthran having perfected the ability. Unfortunately though they cannot read the minds of servants of Chaos for too long lest they become corrupted by Chaos as well.
* PsychoForHire: The Arbiter, Ripa 'Moramee.
* {{Retcon}}: Quite a few, not the least of which being Fulgrim being an Eldar instead of a Primarch and the Chaos Space Marines being Insurrectionists who have willingly joined the Four Powers.
* ShockAndAwe: The Eldar Farseers and Lord of Change are both capable of discharging powerful blasts of electricity.
* ShoutOut: [[TheFellowshipOfTheRing "Fly you fools!"]]
* SkeletonsInTheCoatCloset: Maughan-Ra
* SpaceElves: The Eldar
* SparedByTheAdaptation: [[spoiler: Chyler Silva and Dimah Tchavoka in the Corbulo chapter. Subverted with Junjie Chen, who lives a little longer but ultimately dies anyway]].
* SwordAndGun
* TechnicolorFire: The flames of Tzeentch's servants.
* TeethClenchedTeamwork: Villainous example. Lord Bale and the Arbiter hate Sindri due to his being 1: A human, 2: A servant of Tzeentch (they're both servants of Khorne at heart), and 3: Preferring PragmaticVillainy.
* WarIsHell
* WingedHumanoid: Bahharoth and his Swooping Hawks, as well as the Lord of Change.
* WorldOfBadass: Especially since it's two of these being fused into one.