Search through urns, barrels, and crates. I haven't put any points into Laboratory Use (where you can use 3 ingredients) but this would seem to make reagents even harder to stockpile!! Alchemy uses plant ingredients found all across the Tamriel, typically in the wilderness - such as Dragonthorns, Nirnroots, Corn Flowers, and many other plants ingredients. After crafting those combinations, you will know all the traits of the reagents for the achievements. Companions ESO Companions System Welcome to the Companions System Overview Page. However, I still find myself with tons of solvents but not enough reagents. In general, the portion will give the adventurer a quick boost in stamina, health, magic, and a variety of other benefits.