Add 2 scoops of dried nettles to the mortar
Add 3 Pufferfish Eyes to the mortar
Crush to a medium-fine powder
Add 2 measures of the crushed mixture to the cauldron
Heat on a medium temperature for 20 seconds
Wave your wand
Leave to brew and return in 60 minutes
Add 1 Bat Spleen to the cauldron
Stir 4 times, anti-clockwise
Heat to low for 30 Seconds
Wave your wand to complete the potion