I suspect that we'll be waiting until Easter Sunday.
We desire more of Wyre
I've asked a very similar question before, and Sepulchrave was kind enough to answer, here.I had been under the impression that the bidding between the various NPCs in the Cheshne faction was bidding epic spell levels (the "reservoirs" that they and the PCs discuss regularly) in pursuit of their oft-at-odds goals, but if that's the case, it dawned on me today that those spell slots are replenishible resources, since the casters will gain access to their new spell-casting capacities daily. So, how can their reservoirs be exhausted, which is mentioned several times throughout? Is this perhaps related to epic spell slots (about which I know little any longer)??
A combination of buffer and earned XP; also ritual components and backlash, which may circumvent the need for XP altogether.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.