[quote=@Dead Cruiser]
[@DeltaV] So sort of analogous to wights and such in ASOIAF? Is there anything more fanciful or inherently magical that comes about?[/quote]
Magic of the shooting-fireballs sort isn't really what i envisioned for the monsters, no, because I'm not sure that it thematically fits the appropriate abilities of spooky creatures that only emerge at night. If enough people want your traditional dragons and whatnot then that's also fine, though.

[quote]I have two basic character ideas currently. Most probable among the two is a berserker that wields a sword made from the tooth of some giant monster. The more fanciful character is a sort of sorcerer that gained his powers after eating the heart of a dragon.
[/quote]
Sounds like fun! Though the second would be contingent on whether or not people want the normal fantasy monsters around (of course, you could always just put a not!dragon into the backstory).

[quote=@DracoLunaris]
I really like this concept, it reminds me a bit of a combination of Helliconia and endless legend, though those are both season rather than day cycle based.[/quote]
I'm glad you like it!

[quote]the mushroom-idea could work quite will as an initial easing into the night so that the lack of food production problem scales at a similar rate to the monster situation(also, perhaps by coincidence, the monsters become less edible as the night goes on). There is after all only a limited amount of decaying material (either natural or food that has rotten since it's harvest) around and once that is used up they have to rely entirely on food stores. [/quote]
Maybe. I can't imagine the monsters being too tasty to eat at any point in the night (in my head I pictured them almost being slightly wispy and immaterial, such that after killing one you'd almost expect it to just fade away into fog), but it'd make sense that farmers might abandon their fields outright in response to threats and instead hope they have enough food stored to tough it out.

[quote]does the planet have a moon(if so how big?) or are the stars the only source of skylight at night?[/quote]
A world without a moon would probably be pretty pitch-black at night, so that might add to why it's such a big deal when night comes. On the other hand, having a moon lets us use the word 'moonlight' or 'moonrise' or what-have-you when a paragraph is oversaturated with 'night.' 

[quote]what sort of technology level would the more advanced civilizations be at military technology wise? We talking plate mail armored knights and crossbows, roman legionaries or something in between?[/quote]
I don't have anything locked down yet, but I was imagining something about halfway in-between the two, with military setups being roughly analogous to the early middle-ages; arming swords and wooden shields and the occasional axe instead of tight phalanxes or pike regiments. Nations like Varras that had more stable time to invest in study of military theory might have had more advanced weaponry and tactics.

[quote]Are the heroes undead looking as a result of this?[/quote]
Nah.