What AVID Is: an acronym that stands for Advancement Via Individual Determination an in-school academic support program for grades 4 â 12 that prepares students for college eligibility and success; for all students, but it targets those in the academic middle; implemented school-wide and district-wide; What AVID Is Not:
It's an item specific to Solstheim. Like Michael said, you can kill the big floating Netches. They're relatively slow, but hit hard if they get close. Arrows from range aught to do the trick if you've got a decent Archery score or relative magical ability. You can also buy them from the merchants on Raven Rock. Other than that, random loot is the only way to get it, but Netch Leather won't appear in Skyrim proper, it's only going to appear on Solstheim.
Netches are a type of animal in ESO. Netches are native to Morrowind but they have been found near Blackmarsh and Solstheim and island of the coast of Skyrim. Netches like a rock with tentacles hanging down from it. Netches are able to levitate due to an unknown magical source. Silk Striders one of the type of domesticated Netches are commonly used as transportation and pack mules by Dunmer. Though, after the eruption of the Red Mountain in the fourth era most of the native Silk Striders were eradicated. In TESO Netches are not naturally agressive and will not agro unless attacked.