Changed my mind, i think Hultressa's strength is most important at the auction
Hultressas strength matters less if Voidreaper has more backup dancers. One vs one maybe. But that's not what's being risked here. Hell, it's not even what's being planned for.
It's one vs anywhere between more than a dozen and less. The fewer distractions in play, the more sorceresses she'll have on hand to fight against Hultressa and whomever else takes their shot.
At that point it's not going to be a duel. It's going to be one vs two, or three, or however many Voidreaper can keep at her side in the chaos. Peeling away backup isn't just going to help Hultressa, it'll help ALL of Voidreapers rivals that come for her head, and that's a much bigger force multiplier than Hultressa herself
Edit: I think people are badly misunderstanding something here.
Voidreaper doesn't just have her cabal of Sorceresses to draw from. She also has the ostensible combined remaining military of the Claw of Dominion and the Fortress of Eternal Torture serving as her enforcers. Yes, turning the cults against her can help mitigate that numerical disparity. But the majority of our ability to break past that on a personal level if going to come down to Hultressas Horrors as breakthrough elements and vanguards to overcome the defensive positions and more normal supernaturally skilled Druchii warriors
Hultressa facing exhaustion is as much an inevitability as Voidreaper herself. And the rest and prep won't be about mitigating any elements for some climactic duel. It'll be about being better able to wipe out those less mystically inclined Druchii at cost.
That's why it's more important to just go for bombing: Because it's going to split more and more of the Druchii into quarreling factions, meaning
we won't have to fight through them.
If everyone sees the food production facilities as Free Real Estate, everyones going to fight for them.
All of them.