* CompleteMonster: [[EvilSorcerer Ad Avis]], the BigBad of [[VideoGame/QuestForGloryII the second game]], is a cruel, misogynistic wizard who takes over the city of Raseir, where he turns it into a hellhole where slavery is permitted, women are forced into harems and treated as dogs while Ad Avis slowly drains all the magical life force in the city. Seemingly defeated, Ad Avis [[BackFromTheDead returns]] in [[VideoGame/QuestForGloryIV the fourth game]], where he is turned into a vampire by his mentor [[OurVampiresAreDifferent Katrina]] and intends to summon a monstrous EldritchAbomination to plunge the world into eternal night and chaos. [[TheStarscream Betraying Katrina]], Ad Avis also intends to torture [[PlayerCharacter The Hero]] to death while trying to bring about [[TheEndOfTheWorldAsWeKnowIt the apocalypse]] to [[ItsAllAboutMe satisfy his own ego]].
* CrowningMusicOfAwesome: The series as a whole generally has memorable music, but a few tracks ascend to Awesome levels, [[http://www.youtube.com/watch?v=uaKj8VQ7ePs particularly]] [[http://www.youtube.com/watch?v=V13HEisneF4 in]] [[http://www.youtube.com/watch?v=dCMtUQbe1HQ QFG4]]. There's also the [[http://www.youtube.com/watch?v=H0GhLzOVRkQ titular theme song]], but the most famous song of the entire series (and quite possibly that entire era of adventure games) actually comes from the first game, played in [[http://www.youtube.com/watch?v=JDUrQSIRgOo a certain lovely wizard's garden spot...]]
* GameBreaker: The Paladin class as a whole. In ''VideoGame/QuestForGloryIII'', once the Paladin earns the "Heal" ability he's granted the Magic skill. By ''VideoGame/QuestForGloryV'' the Paladin can learn ''every'' spell in the series, except for the handful of that specifically require being the Wizard class to learn (most of which are plot-specific). The Paladin is therefore not only a hybrid [[MagicKnight Fighter/Wizard]], but he ''also'' carries the best sword in the game, ''and'' has his own class abilities on top of that!
* GoddamnedBats: Badders in [=QFG4=]. Baddies and Humunculi in [=QFG5=].
* GoodBadBugs: Even though the Paladin isn't ''supposed'' to have magic, because the games treat his abilities as spells — except Paladin abilities use the Honor skill as their modifier, rather than Magic and Intelligence — he's able to unlock almost every spell in the series. As noted above, this makes him a serious GameBreaker, as he not only gains all the advantages of the Fighter and Wizard, but none of their weaknesses, ''and'' has his own unique abilities, on top of the best sword in the franchise.
* ShipToShipCombat: Between fans of the Hero/[[FemmeFatale Katrina]] and the Hero/[[SealedGoodInACan Erana]] in ''VideoGame/QuestForGloryIV''. Then came ''VideoGame/QuestForGloryV'' and two more ships came between the Hero/[[LadyOfWar Elsa]] and the Hero/[[HelloNurse Nawar]].
* ShipsThatPassInTheNight: Some fans lamented that [[UsefulNotes/FurryFandom the Hero couldn't hook up]] with [[CatFolk Salla]] in the fifth game. This was rather difficult since [[ShrinkingViolet Salla never speaks out of shyness]] and [[StaticCharacter practically nothing is known about her]].
** Attacking Tanya or Toby in Quest for Glory IV doesn't immediately kill you; Toby will just force you out of the room. But it makes the game unwinnable, as Tanya will charm and bite you if you go back into her room after that.
** A mild example if you let Igor die but let the gypsy escape. You can never again set foot in town during day, because it will set off an automatic sequence where the Burgomeister will try to arrest you for freeing the gypsy, and you'll escape the town only to get turned by a vampire that night.
** In the earlier games you can drop critical plot items, never to be recovered. You can even eat the Magic Acorn in the first game (which, as the Dryad specifically told you a few seconds before you got it, you need to create the plot-critical Dispel Potion).