TO DR OR NOT TO DR - AS AC*
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The quasi-infinitely-looping question of AC as Damage Reduction, my potential take on it :
Precepts:
 - use fixed damage on the DM side of things
 - keep variable damage on the PC side of things
 - use fixed damage reduction values on the DM side of things
 - use variable damage reduction on the PC side of things
 - default damage reduction (armour, level) is "resist all" 
Implementation :
 - level = one die of damage reduction
 - armour = one die of damage reduction (based on type of armour)
 - armouring "effects" = "perhaps" one die of damage reduction (may also be subsumed into the "class" portion)
 - resist X values converted to die value (1d8, 2d6, etc.)
 - use average + level for monster dmg (8+2xlevel? ... ask "Yak of GitPG" for what that should be - he's impressive at "math cruching"!)
 - use "what feels right" for monsters (might have to adjust hp...)
Consequences :
 - might take a bit longer to calculate final damage
 - brings in "armour as DR" w/o overhauling the whole thing
 - we get an additional "lever" to play with (magic items, effects, itemization, etc)
 - might "require" a table of reference for die values (if modifications in-game became a thing - note to self : it will.)
 - adds in a layer that is fairly superfluous (the proof being: it's not in there and the game works fine)
 - multiple attacks are reduced in relative potency a bit (but I'm not seeing this as a bad thing in 4e...)
Justifications/concessions :
 - I like it!
 - It's not that hard to use
 - It can give the illusion of player agency during the enemies' turn
 - It does require a bit of fiddling with monster hp (unless...?*)
*increase PC damage by +level?
 - I'm not a fan of the "multiple attacks = king of dmg" thing going on right now, something that hits multiple attacks harder than single attacks feels like a good thing to me.
 - I really want dragons (and galeb dhurs) with very high resist values that "require" special items or preparations to be able to pierce (I know I can do this now... I know... but this way, it's "baked in" and well... ... ...yup, that's the whole of my argument.)
Options :
 - remove AC as a defense**
 - replace "target other defense than AC" as "ignore DR for this attack" in pertinent powers
 - attacks target Fort or Ref (defender's choice)***
***this would mesh very well with my goal of having more attacks simultaneously target many defenses : hit AC to deal dmg, hit Fort to push, hit Will to daze, hit Ref to ... 
**We'd use Ref for most "touching", Fort for "power through", Will for... well, Will is pretty obvious...
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That's my "blargh" for today.