This is the first time ive ever come across this, you take albino spider pods and combine them with gems/soul stones and they give you different spiders that you can throw at
Imbuing Chamber (Spider Crafting) - The Elder Scrolls V: Skyrim Wiki Guide - IGN
Zehn Jahre lang unentdeckt - Skyrim-Fan findet neue Spinnenvariante
Skyrim:Spiders - The Unofficial Elder Scrolls Pages (UESP)
Character Build: The Wolf Spider - Skyrim Character Building - THE SKY FORGE
10 Tips for Better Role-Playing in "Skyrim" - LevelSkip