The thought that his mana was already almost too dense for most of the Witches to handle even before it advanced today gave Wolfe a great idea.
The power feeding went both ways. They could gain aura by feeding off him, and part of getting to the Second Rank was condensing the aura to the point where it collapsed and reformed.
So, if he fed mana to all of the witches bonded to him who hadn't reached the second rank yet, they would likely pass out, but their aura would improve by leaps and bounds.
As their aura improved, they would return power to him, which would help him form his fourth Mana Core.
This one was exponentially harder than the others, and Wolfe suspected that the problem was that he didn't have strong enough partners to actually make the best use of his ability to grow the way that he did at Rank Two and, to some extent, even Rank Three.