Yes, but paladins must pick a deity and have the same alignment as the deity. See below for more on this.42. can paladins be of any alignment?
Yes - ish. There is a Blackguard ("anti-paladin") class as well as the straight paladin, but there's also a more fundamental conflict in 4E's cosmology that explains why "bad" paladins might have radiant powers whatever their alignment. The key is that they serve gods, and there is a big opposition between the gods and the demons. Demons tend to be vulnerable to radiant damage, but divine servitors often aren't, even if they are "evil".43. assuming the answer to #43 is "yes," if a paladin isn't of good alignment, does his/her divine challenge still do radiant damage?
Note that like the cleric, the paladin doesn't actually lose anything rules-wise for violating his or her alignment restriction. (Though the paladin's superiors might do something to punish the heretic, like putting a price on his or her head.) So effectively, there is no restriction.Yes, but paladins must pick a deity and have the same alignment as the deity. See below for more on this.
42. can paladins be of any alignment?
43. assuming the answer to #43 is "yes," if a paladin isn't of good alignment, does his/her divine challenge still do radiant damage?
danke.
Paladin is a Defender
Blackguard is a Striker.
Because Blackguard is a "subclass" of Paladin, in theory, I do not know why a Paladin couldn't take a Blackguard power, or vice versa. That mechanic is a little messy.
Actually, I'd dispute Orcus. All the other (plus Vecna and beyond) have paladins, for sure - but Orcus is a Demon Lord, not a God. His origin is Elemental/Primal (and then twisted), not Divine, so I don't think he gets paladins. He gets lots of demon servitors, though. And undead. Lots of undead.All gods have angels as servants, so all gods have paladins in their service. Paladin = "Defender of the Faithful". Orcus has Paladins. Corellon has Paladins. Moradin has Paladins. A blackguard of Corellon might be a little strange, but not necessarily wrong.
33. what would be the effect of houseruling non-at-will powers to all be encounter powers (such that you get them all back at the end of an encounter; i ask because it seems like this would make things simpler)?
34. have the books been reprinted with errata?
36. what does errata mean when it mentions "rare" magic items (as i've seen no mention of this in the player's handbook)?
37. are sneak attack and hunter's quarry damage maximized on a critical hit?
38. does push/pull/slide have to move its target in a straight line?
39. following up #33, can someone give an example of how daily powers are significantly more powerful than encounter powers?
40. is it true that the higher of dexterity or intelligence is not added to armor class when wearing heavy armor?
41. does (creature) size matter (for anything mechanically)?
42. can paladins be of any alignment?
43. assuming the answer to #43 is "yes," if a paladin isn't of good alignment, does his/her divine challenge still do radiant damage?
Actually, I'd dispute Orcus. All the other (plus Vecna and beyond) have paladins, for sure - but Orcus is a Demon Lord, not a God. His origin is Elemental/Primal (and then twisted), not Divine, so I don't think he gets paladins. He gets lots of demon servitors, though. And undead. Lots of undead.
Edit: this is by RAW, of course. If you want Orcus paladins in your house game, crack on!