This is from Patch Message dated Sept. 19, 2006
Linc:
http://eqplayers.station.sony.com/ga...date=9/19/2006
"We have introduced a new con color, dark blue, which represents a range of blue con NPCs that give a bonus to their experience due to being very close to your level, generally within 5 levels. The concept of a dark blue con NPC has existed in EQ for a while now, but we've decided to change the con system to visually include this range so you can visually see when an NPC falls into this "sweet spot". To properly display a different shade of blue, we've had to reorder the cons a little bit. From trivial to highest con, the colors are now:
- Gray - This creature is trivial to you and will give you no experience for killing it.
- Green - This creature is not much of a threat, but will still give you some experience.
- Blue - This creature is below your level, but high enough level to give you experience.
- Dark Blue - This creature is below your level, but close enough to provide a solid challenge and gives you more experience than normal blue cons.
- White - This creature is the same level as you
- Yellow - This creature is slightly above your level.
- Red - This creature is well above your level."
But from a patch message I saw dated Feb. 13, 2002 it stated that characters under lvl 8 would no longer see Lt. Blue con mobs.
http://everquest.allakhazam.com/story.html?story=722 here.
Could not find anything earlier than that mentioning con color changes.
*shrug dunno.