It is exactly equal to AC, well...

PREV is equal to ac when cast, and on items when equipped, by/on good players. PREV does not work neutral or evil. It does not show up in the AC slot in the stat screen but it is there.
PRGD is broken.

Placeholder for damage discussion

dodge = (dodge from items, spells, abilities, etc)

if enc == light, dodge = dodge + 1
else if enc == none, dodge = dodge + 9

if agility >=50, dodge = dodge + floor((agility-50)/3)
if agility < 50, dodge = dodge + ceiling((agility-50)/3)

if charm >=50, dodge = dodge + floor((charm-50)/5)
if charm ...

Placeholder for Accuracy discussion

For a player attacking a monster

Roll chance to dodge (some cap possibly) (monster dodge * .9)
If success -> dodged, end
if fail -> Roll acc vs AC
if success -> miss, end
if hit -> roll crit
if success -> roll critical damage
if fail -> roll damage
if damage <= dr -> hit glances, end
if damage > dr ...