All Exotic Weapons with Special Effects?

[Qwertystop]

Dragonsplit, from MMIV: One Handed: (M) 1d6; critical 19-20/x2 (slashing) or x4 (piercing). Not a double weapon; you can freely alternate between using them as slashing or piercing weapons. Counts as a light weapon for Weapon Finesse or TWF.

Added

There are two quirks to the Duom. The first is that it was reprinted in the Dragon Compendium as a martial weapon. So if you go by which source was printed last, then Dragon Compendium supercedes the A&EG.

The second quirk is that the -2 penalty only applies if you attack a second adjacent target after attacking your first target. If you're only attacking a single target, then you can still attack them if they are adjacent, and without the -2 penalty.

As far as getting a free attack... I don't see that supported by the text:

"Those proficient with the duom can also attack adjacent foes with the reversed heads using a practiced "reverse thrust." Apply a –2 penalty on the attack roll if you use the duom to attack a second, adjacent opponent in the same round you attacked the first opponent."

IF you use the duom to attack a second adjacent opponent, THEN there's a -2 penalty. It doesn't say that IF you have two opponents, one at 10', and one adjacent to you, THEN you get an extra attack. To me at least it looks like the text assumes that you're attacking two opponents because you have the BAB to do so, not because you're attacking with the duom.

However, if your DM lets you wield it as a martial weapon, then it's essentially a spiked chain that you don't have to spend EWP on.

Here's another exotic weapon that wasn't mentioned in the Haberdash:

Bola Flail (Ghostwalk p. 42). You can make trip attacks with this, and you get a +2 on disarm checks as well. But that's not what makes it obscenely good: you can also throw it as a ranged touch attack to trip an opponent. If you hit, your opponent has to make a DC 15 Str or Dex check to avoid the trip. Regardless of whether or not they are tripped, your opponent has to make a grapple check against your attack roll. If they fail, they are considered grappled until they can extricate themselves from the bola flail (full-round action). Even better... bards from Salkiria gain Exotic Weapon Proficiency: Bola Flail as a free bonus feat.

Updated Duom re: Martial-if-Dragon's-OK. Added Bola Flail.

Also, as a Duom is explicitly a variant Longspear, can you set it against a charge?