I have been playing Dungeon and Dragons since 2nd edition and one thing that everyone I have ever talked to agrees with me on is that the 2nd edition monster manual did it right. Each creature should have its own page or two. On this page is should talk about not only combat, but the creatures habits, culture, environment, useful things about its body or whatever. I also feel it should be written with the sense that a biologist or cryptozoologist written it. So it feels like it’s just one persons thoughts on the creature just in case the dm wants to go some other direction with the creature.
I would also like to see the books look like tombs as in 3rd edition. With the simple sketches and all.
This last one I think some of people are going to disagree with me on, but I would like to see each tomb be one subjected.
-Players handbook- (The exception) Which I don’t care if it looks like a tomb or not. The basic rules for Players and DM’s. I personally would like to see each "class" be very basic but with huge amounts of customizability. To even the point of only 4 or 5 classes -Warrior, Mage, Rouge, Acolyte- But with the rules of Warrior be able to make a Barbarian, or a Paladin. I don’t know, I love options and extremely open classes are better to me then 50 very limited classes.
Tomb of Arcane Magic –Feats and spells - I would also like to see spells have a base, and modifier’s and each be pc or dm created. – 1st level (Lesser Acid Orb) modified to 2nd level – (Melf’s lesser Acid Ord) - Silent, Still, Quickened, and the like would also be Modifiers. I would also like spells that increase every level to have an more official name to them instead of summon monster one, Novice Summon, Master’s Summon. Ect.
Tomb of Divine Magic – Feats and spells
Tomb of Combat Styles - Warrior based feats and class abilities.
Tomb of Combat Techniques – Rouge Based feats and class abilities.
Tomb of Artificts (Just a book of magic items)
Tomb of Monsters (First Monster Manual should be more mundane creatures and Additional books should go to more fantastic creatures with types of lore about them like them like.) Like the 7 Phoenixes that live in the 7 temples of the sun. Each phoenix being its own color. You know, give concepts of each creature that might lead to adventure ideas.
Tomb of Engineering – A Book on how buildings are made and DC’s of break DC’s , Traps and other things that fit.
Tomb of Planes –
ECT- Wear the books feel less like manuals and more about subjects in a fantasy world.