[OOC] Converting Your Character: Best of the Rest

Rounding out the list of character classes from 3rd Edition is a motley array from various sourcebooks.

Archivist (Heroes of Horror)

This divine spellcaster shares many characteristics with the cleric class (not the least of which is his spell list), so I recommend the devoted cleric build (Player's Handbook p61). Any deity might have an archivist in its service, though Ioun, Erathis, and Avandra seem the most appropriate.
With your DM’s permission, consider trading your turn undead power for this new option:

Channel Divinity: Dark KnowledgeArchivist FeatureYou draw on hidden secrets to hinder your enemies.EncounterDivine
Standard Action Close burst 5 (8 at 11th level, 12 at 21st level)
Special: When you use this power, choose a monster origin from the following list: aberrant, elemental, fey, immortal, or shadow.
Target: Each creature of chosen origin in burst
Attack: Wisdom vs. WillHit: Until the end of your next turn, the target is weakened and grants you and your allies combat advantage.Miss: The target grants combat advantage to the next attack you or any of your allies makes against it.

Artificer (Eberron Campaign Setting)

A sneak preview of the artificer class is slated for publication on D&D Insider. That article will provide all you need to build an artificer for 4th Edition.

Dragonfire Adept (Dragon Magic)

This class is mechanically similar to the 3rd Edition warlock, so you’re probably best using that class. The scourge warlock build (p130) is a good choice, focusing on damage-dealing rather than deception. You’ll probably want to re-flavor some of the warlock spells to have a draconic theme (and you might even want to try designing your own draconic pact abilities).

Along those lines, try replacing your eldritch blast with dragonfire blast. It functions exactly the same except that it deals fire damage (and adds Fire as a keyword), and is “Ranged 5 or Blast 3” instead of Ranged 10.

Dread Necromancer (Heroes of Horror)

This arcane spellcaster has a mix of spells and class features drawn from the 3rd-Edition wizard and cleric classes, along with a few unique powers. At lower levels, the class feels like a traditional striker—plenty of single-target damaging effects such as charnel touch and inflict wounds—but at higher levels it broadens into more area-effect spells appropriate to a controller (Evard’s black tentacles, acid fog, mass inflict wounds). Your best fit is probably the scourge warlock build (p130) with the infernal pact, adding in a few wizard powers via multiclassing.

Healer (Miniatures Handbook)

This one-note spellcaster focuses exclusively on restoring the health of her allies. Choose the devoted cleric build (p61), and take every opportunity to select powers that heal or boost your allies. Keep in mind that in 4th Edition, it isn’t as easy to forgo contributing on offense as in previous editions of the game—you can’t give up attack powers to gain extra utility healing powers.

Marshal (Miniatures Handbook)

This class inspired what became the 4th Edition warlord, so use that class for your converted character. The biggest change to your tactics is that instead of using passive auras to aid your allies, you'll be activating attack and utility powers to grant particular boosts to one or more comrades. Oh, and you'll finally be able to provide healing, which you've probably been wanting since 1st level!