A volatile solution of liquefied brains and life-preserving water, manufactured by mind flayers from the leftovers of meals that they would not dare let go to waste. If you listen closely to the bottle, you can mentally feel the suffering and pain that the minds now pureed into the bottle underwent. 

The bottle holds 2d4 + 2 uses of the liquid. If a creature capable of smell and that has a clear center to its nervous system (e.g. human compared to gelatinous cube) inhales the vapors, it gains +7 to its Intelligence ability score for the next 48 hours. Every 4 hours, however, the creature must make a DC 10 Constitution save not to gain the flaw "Everyone and everything around me wants to kill me, but not if I kill it first" for the next 5 minutes, after which it is removed.