* AuthorsSavingThrow: The 7th Edition Codex at least attempts this by retconning the notorious Khornate Knights incident to exclude any mention of the Sisters of Battle, as well as showing the Sisters as brave warriors respected by the Grey Knights in other lore.
** It also removes the notorious GameBreaker Plasma Siphon entirely and tones down several of the most unbalanced options the Grey Knights had in the 5th edition codex.
** Their Marysueness has been downplayed as well. Casualties are heavy, resisting the warp corruption is difficult, and at least one case of defeat is described.
* BaseBreaker: The 5th Edition codex has a great many people wanting to murder Matt Ward by his retcons of the chapter, various internal WhatTheHellHero, and his apparent losing of the plotline regarding Chaos being TheCorruption.
* CanonDefilement: Sweet Emperor of Mankind, even [[BloodRavens C.S. Goto]] had a better idea of how Warhammer worked than the guy who wrote the fifth edition codex.
** FranchiseOriginalSin: However, much of it comes form older (lesser know) lore that wasn't used for Codex Daemonhunters; yes this includes killing priest and using their blood as paint.
* CreatorsPet - Supreme Grand Master Kaldor Draigo. A few early achievements are as follows: Single handedly killed the [[NighInvulnerable daemon prince M'kar]] in his first combat action with east. Single handedly banished the [[PhysicalGod daemon primarch Mortarion]] back into the warp after easily beating him to within an inch of his life and [[FlatWhat carving his predecessor's name into his heart.]] Took down [[AxeCrazy a chosen Bloodthirster of Khorne]] in unarmed combat, stole its axe, and reforged it into a sword with only his mind. The Fandom treats him like a bad joke at best and a sign Matt Ward is a talentless hack trying to one up all other authors in Games Workshop.
* EnsembleDarkhorse: Castellan Crowe was regarded as the best thing in the 5th editoin codex.
* GameBreaker: The Plasma Syphon. A weapon which makes any plasma weapon useless against a unit equipped with it. The problem was that some players began to take the fluff into account and apply it to anything based plasma. Complaints were made to Games Workshop who ignored these letters. When the FAQ was released amongst the [[InsaneTrollLogic many leaps on logic]] it was confirmed that the weapon made anything related to plasma useless. Tau players are now refusing to play anyone with Grey Knights as 95% of their weapons are based on plasma technology.
** Fortunately even Games Workshop seems to have realised how unbalanced the Siphon was, as the 7th Edition codex excludes it entirely.
* MagnificentBastard: Alaric becomes this at the end of the Omnibus, seriously, who could have managed to fool not one, but three greater daemons along the series, or make a plot to take down an entire daemon world and the chaos lords at its command? And all of this while fighting through hell and surviving numerous {{Mind Rape}}s?
* {{Misblamed}}: Some people have noted this about Matt Ward's 5th edition codex. While Ward is credited as its writer, the writing team ''has'' admitted they collaborate to a degree on codexes, and several of the most infamous bits of Ward's fluff (particularly the Khornate Knights incident) are due to Ward implementing 2nd edition-era fluff rather than them being entirely his own invention.
* RescuedFromTheScrappyHeap: The recent Black Library books has greatly toned down Kaldor Draigo's sueness.