Thank you! This helps! But just to clarify for 100-150 gp i get a blinding stone with a 20' radius and a dc 15 reflex save for ten minute blindness, i assume it can be reused and has a range of something like thirty feet (thrown) but i wonder if a higher level one could be made? At what dc and cost increase? And what are ALL the effects of blindness? And if this lightning stone wouldnt be reuseable, how much would one that iscost?
Alchemical items are never reusable.
And by looking up the Blindness spell which only effects 1 creature at a time, you should probley make it a one shot Potion/Wonders Item. Single use, spell completion item; spell level 2. So a Stone of Blindness should be at least 2 x 3 x 25 = 150 gp. Requirements to craft: Craft Wonders Item, Blindness/Deafness 75gp + 6xp.
I know this is different than my last post but we need to realize this item is directly replicating a spell, therefore we need to look at magic item creation.
If you want an Alchemical Item to do this the best idea I can come up is to invent a Flash Power Bomb. They made a couple in the Oriental Adventures.
Eggshell Grenade, Dust: 10 gp; Direct hit: Blinded for 1d4 rounds, Splash (5ft.) Fort DC 10 or Blinded for 1 round. Range increment: 5ft; Craft (Alchemy) DC 20.
Eggshell Grenade, Flashpower: 60 gp; Must be thrown into a fire; Splash (10ft.) Fort DC 10 or Blinded for 1d4 round. Range increment: 5ft; Craft (Alchemy) DC 25.
The Dust grenade; I would allow anyone with the Craft (Alchemy) to make it. But the Flashpower grenade should be like Acid flask and Alchemist Fire flask where you need to be a spellcaster to make.
If you like the grenades then get yourself a copy of the book. There are more rules for the grenades.