Spit, Fente, Sintara and Heeby. Obviously the former two at least gain flight ability through either CoD or into BoD. We know that Heeby was flying in DH, as was Sintara as she took off in its closing pages.

something Fitz noted somewhere along the way. I think it was while he was in the Kelsingra Map Tower when he was there in the latter stages of AQ, where he noted the stained-glass window of the woman and dragon (the one which has captured my imagination for years!!) . I think the dragon wore a jewelled collar but, other than that, there was nothing to suggest any kind of subjugation to the woman. In the woman's hand, or behind her, was something but Fitz couldn't quite determine if it was a weapon or a wand of office. This is what I think of when I look at the spear/polearm. Though it must surely be Rapscal who wields it on the cover, given the figure is atop Heeby, and not a 'female', it is possible that the object is either similar or the very same...after all, the window is within the map tower of Kelsingra and it is in Kelsingra where the events will take place in CoD and BoD, and discoveries made. Possibly Rapscal or someone finds the actual object that is depicted in the window and thus uses it.

I often believed that the stained-glass window in the Kelsingra Map Tower to be a portrayal of both past and future, though more future, a little like Wintrow's window that he made of the tree that beheld both a dragon and a serpent. While both were part of the realm's past, Wintrow also proved to be a contributor and a connection to their future (just as he, by virtue of his blood, was a connection to their past). I did have thoughts that the woman depicted in the Kelsingra Map Tower window could have been Nettle, given her 'Queenly' attitude, relationship with Tintaglia, and her connection to both Fitz as the Catalyst and also as the daughter of Fitz who is the foundation of the House Farseer. I also thought it could have been a depiction of the female Judge of old (similar to the female depicted with the dragon in statue form in the ruins of ancient Frengong in Homecoming), but that there was a blood connection between she and Fitz/Nettle anyway.

It is indeed likely that nettle got herself entangled further with Tintaglia. Her attitude also befits an Elderling queen. Far more so than Malta ever did. The fact that she is also of the blood royal, will only enhance the facts. She is mature beyond her years, and has considerable power with the skill, which we all know comes from having Elderling ancestors. Fitz may be the skillmaster, but his education was spotty, without any draconic aid and without a true teacher. Nettle has all those things he did not have, as well as more time.

It is likely that the polearm is found in Kelsingra. There are none among the crew of the Tarman that have skill in using a forge, particularly on such scale. Considering that the rain wild traders have not been had any real warfare, there is no logical reason for them to have such skill either.
That leaves two possible sources. Trade and discovery.
Trade has three key sources. Six duchies, Chalced, Jamaillia. A weapon with such blade indicates war with ground troops and/or horse-mounted troops, not ships. the last has no known neighbors on the ground, so scratch that. Chalced would only want one thing from Elderlings/rain wild traders. Dragon parts. That leaves the six duchies, and they are generally too far away.
That leaves discovery. Kelsingra is right there, so source is very likely to be that place, or its neighboring Elderling cities.

The design on the blade resembles a glaive or a Voulge. Both were used for stabbing and, if hooked on the back, pulling riders off their horses. The glaive was utilized to slash, while the voulge was used for hacking. Both of those weapons can be easily used in ceremonial circumstances, since they are typically held in the hand, where swords are sheathed.