Suppose I have an Order of the Mutant blood hunter who has a Wisdom score of 3, and is level 9 (or greater) so has a "mutagen bonus" of 3+.
If this character uses the celerity mutagen, the following effects apply:
Your Dexterity score increases by an amount equal to your mutation score, as does your Dexterity maximum.
Side effect: Your Wisdom score decreases by amount equal to your mutation score.
This would mean the mutagen drops the blood hunter's Wisdom score to 0 (or less, if they're higher level). What consequence does using the mutagen have for this character?