For the really, really high level stuff, check out the VGTact FAQ.
http://www.vgtact.com/faq.php
Especially sections 3.5, which I give myself permission to quote here.
Quote:
3.5: Are there any other forms of diplomacy?
Other forms of diplomacy, such as Embassies, Consuls and Haggling have been mentioned, but very little is known about them. Embassies are alleged to be the high-end diplomacy content, and may involve parleying with non-player races, such as gnolls, ksavari, giants etc. Consuls are supposed to allow players to give quests and missions to other players. Haggling is intended to give diplomats a permanent advantage (i.e. you do not have to haggle at each purchase) to prices and other costs within the game, through performing certain diplomatic tasks (yet to be finalised).
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Doddy Curumehtar- High Elf Arbiter and Alchemist (perhaps Druid or Sorcerer too, if I decide to adventure)
VGTact.com - Finessing Telon, One Parley at a Time!