Champions of Torm follow Torm (duh), and so Mordor toons technically should not be allowed to make a Champion of Torm character (since in order to level a CoT, like a Paladin, you must be honest and devout to your deity, and Torm is the patron of Paladins and enemy of corruption and evil). So neither Paladins nor CoT should be usable on the Mordor side. You cannot have an enemy of evil serving Sauron. Period.
As seen here,
http://nwn2.wikia.com/wiki/Divine_Champion the implementation of divine champion is a bit funny in nwn, restricting you to one diety, its like red dragon disciple (in case u dont see it; the actual class is dragon disciple and you choose the dragon), the only thing different mechanically for divine champions is that the weapon focus requirement is meant to be the diety's favoured weapon.
Basically ignore the Torm bit, since its not even relevant to the GvM storyline.
Honestly the closest you can get to the divine champion in pnp seems to be the Divine Crusader.
EDIT: actually just found the divine champion (its in the forgotten realms campaign setting 3.0), has knowledge (religion) 3 ranks +7 bab and focus in dieties favoured weapon as reqs (no alignment req), the smite works on ANYONE who hasn't got the same patron as you. (quite nice really)
Other funny things in nwn:
- Ray spells have saves, and don't have touch attacks.
- The harpers (harper scout) is an organisation that exists in the forgotten realms (only relevant to single player, just like cot), and nowhere else.
- sorcerers take the same time to cast metamagiced spells as wizards.
- evil clerics destroy undead, and spontaneously cast cure spells.
- blackguards and assassins don't have their own spell lists (as ranger/pally), and don't qualify as caster levels for divine/arcane classes respectively (such a bad implementation).
- there is 10001 other things that i also resent, but i can't think of them right now ;p
if your interested in looking over how things are in pnp dnd and how nwn has changed them, and uh.. changed them, look at
http://www.d20srd.org/, a minor note, nwn is dnd 3.0, while the srd is 3.5.
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