I was wondering about this for a while now and the wiki seems a bit outdated, so I'll ask here...
Where can you get Spellpower potions of Superior x? (the +25 spellpower ones)
I know so far:
Inferno, Spark, Efficacy, Mending -> Object Desire in House Phiarlan
Ardor, Nihil -> House of Wizardry in House Jorasco
Are there any superior potion vendors for Freeze, Erosion, Cacophony, Brilliance and Impact?
I can't seem to find any.