If I remember correct, there are three weapons linked to Arthur. A sword, spear and a dagger. If the Knights have the sword, and the athame is the dagger, so where is the spear?

What if nemesis is something that was once human, but went through some kind of Ascension ritual. Similar to the dark hollow, but instead of based in necromancy, it was based on outsiders or magical corruption. So it is not a being reaching in acting as a bridge, it is a bring reaching out acting as a bridge.

While Kincaid did shoot the fallen, it was done in the presence of a knight of the cross. I figure that adds to his chances. Other wise it seems the fallen are easy to take out.

If he does show up, he can pass those two coins from his vault to the warden of demonreach. The one prison that could truly keep it contained.

Part of me thinks that only heads of members and signitories will attend, but it is likely they will dispatch ambassadors or representatives.

So the wardens are the enforcement aspect of the council, the senior council is the leadership, we know that the wizards are distinguished by the magics they specialize in. I wonder if there is a ranking or list of those wizards with powerful responsibilities. A secret ranking is a an already exclusive group.

Seeing as the island was a huge magical construction, would it not make sense for the creator to have built the never never side as well? There is potential places that reflect the well, like the underworld specificly tarturus. An aspect of the well could be formed to link and bind it, to empower and secure. I can imagine something like the lighthouse or the cottage of the island, intruding onto those reflections.
Look at what a body jumping necromancer and a spirit of intellect was able to build for never never defenses. If the well is so epic, imagine that magic used to construct their one bit of e never never.