Dwezzo's uncle had told him he could intervene if things got too out of control, and as far as Dwezzo was concerned "something that threatened his personal library" was the very definition of "too out of control." And yes, the sudden appearance of an oak tree, militant nymphs and owlbears did count as a threat to his carefully-preserved collection.
Fortunately, the idiot human who had started this mess was currently pinned under a passionate orc-lady, so Dwezzo was able to get to the Chronivac with no difficulty. First things first. . .
The owlbears in the chronivac's range began shrinking, as their faces ceased being the feathered faces of owls and became the normal hairy faces of mammals. Their tails were growing proportionately longer as their bodies continued to shrink, the nymphs riding them either dismounted or fell to the ground. The threatening owlbears were now a collection of purring housecats being petted by some of the more easily distracted nymphs.
But not all nymphs were easily distracted and some were beginning to ransack the place looking for the formula. Dwezzo could have easily negated the effects of the potions and turned them back into soldiers, but a bunch of angry, confused soldiers would probably be as much or more of a danger to his books than the nymphs. Ah got it.
The nymphs were now a collection of attractive young ladies, half of them human and half of them gnomish, in town for a convention of female librarians. They were ooing and ahhing over some of the gems in Dwezzo's collection, handling them with what he considered appropriate care. "Ooh" said a particularly pulchritudinous gnomish lady "A copy of the grimoire of Nystul with annotations in Malygris's own hand!"
(Not all of the transformed nymphs had invaded the city. Urmak and Sharona, now two graceful nymphs named Umbra and Sylvana, had decided to devote themselves to mutual love and the healing of the forest rather than silly plots for world domination. Well out of the range of the Chronivac, they were currently eliminating the metal traps left by fur-hunters.)
And now for the idiot who had started all this, and had tried to turn Dwezzo himself into a bimbo. Well, he, using perhaps inappropriate language. seemed to be having a good time, at least until the nymphs had shown up. And since his desire to get laid had been at the root of the problem, why not simply ratify his--her--current condition?