Spoils of Victory?

This is adventure 20 of 25 that is roughly designed to take characters from level 1 to 25 that I will be sharing over the month of September. These posts are a part of Asshat Paladin's OSR Short Adventure Challenge, and utilize his Get Ready, Get Set, Go! format.

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Spoils of Victory?
A Get Ready, Get Set, Go! Classic D+D adventure set in The Big Generic City

Get Ready:
With the death of the Dragon things should be back to normal, but the Fay realm is colliding with the mortal world...

Get Set:
Upon returning to The Big Generic City things are better... shockingly better. Most of the damage seems to have been repaired, and in fact things are even better than they were. Everything seems bigger, brighter, more colorful. Fay creatures seem to be bustling around but can only be spotted out of the corner of the PCs eyes. Strange monsters seem to be appearing all over as well.

Go!:
The Fay Court is taking advantage of the weakened barrier between the mortal realm and the land of the fay. The people of The Big Generic City haven't noticed, as they are being turned into fay beings themselves!

Magic continues to be wonky. For spells: 1-2 less powerful, 3-5 normal, 6-9 more powerful+ backlash, 10 random spell effect, roll every time a spell is cast. Potions all become poison, charged items use 1d3-1 charges per use – yes, sometimes they’ll use no charge! Items with a flat bonus all become one step less powerful, +3 becomes +2, +1 items become non-magical!

The PC's investigations will reveal that the Dragon had mate, and that his death should restore the divide between the mortal realm and the Fay realm.

Important NPCs:
Nobles of the Fay Court