Spell Progressions, Delayed Detonation, Landmine Spells, Auto Turret Spells?

[a-d]

Am intending to research spells in-game and was wondering if there already was a list or formula for how to determine the manner in which spells would progress or regress from lower to higher, and higher to lower.

Present spells of interest:
Sleep
Scry
Message

Is there already a progression, regression list for spells?


Extra:
Is there a feat which can gives spells a delay to detonate? Fire off an area effect web then move away before it goes off?
Hey! This could also be used to fire off a number of spells without the target noticing they were under attack until the first one went off.
Especially if you can control the number of rounds it will take for the countdown to end. Three or more area effect spells going off at once.

Oh, or how about real landmine spells instead of explosive runes and dispel?
Oooh! Launch one ahead of a target who you can't get in front of in time then activate later. Like a C4, radio receiver, radio detonator.
Launch, run, hit the switch.

Then again, are there spells that create or summon auto turrets? Temporarily enchanting a rock to shoot lighting attacks at anyone within range?

Do Wizards lose every spell they've gained from leveling up if they lose their spellbooks? That is, if you take or destroy a wizards spellbook do they lose what they'd gained or are merely unable to cast those spells until they find a spellbook with that spell or an empty spellbook into which they can copy their previous spells into from memory?

 

[Dannyalcatraz]

Is there a feat which can gives spells a delay to detonate? Fire off an area effect web then move away before it goes off?

Delay Spell metamagic feat, CompArc.

Repeat Spell metamagic feat, CompArc. Now, that one doesn't do what you wanted- see Delay Spell above- but coupled with Delay Spell, you could get some NASTY effects. Of course, that means using a 9th level slot, so usable with a 3rd lvl spell MAX.

Then again, are there spells that create or summon auto turrets? Temporarily enchanting a rock to shoot lighting attacks at anyone within range?

Earthbound Spell metamagic feat, PHB2.

 

[Whizbang Dustyboots]

You can also research a permanently metamagiced version of a spell, if you don't want to use up the feat. Delay Spell was basically just reverse engineered from Delayed Blast Fireball, after all.