Vidgrod is a dead Nord bandit found in the first part of Halldir's Cairn. His body is found with his dead friends, Agrius and Raen, next to the cairn with magical energies flowing out of it. He has a random weapon and may have a shield. According to Agrius's Journal he and his friends were kicked out of a bandit gang and took refuge in Halldir's Cairn, where they were possessed by Halldir and killed themselves, giving their power to him.
He wears a randomly determined set of light armor; at all levels, there is always a 50% chance he will wear fur shoes and a set of fur armor, while the other 50% can differ; at level 1-5 it can be hide boots and/or hide armor, at level 6-18, it can be leather boots and/or leather armor, and at level 19-28 it can be scaled boots and/or scaled armor or scaled horn armor. Additionally, he has a 50% chance of wearing a set of leveled gauntlets, again randomly determined; it can always be fur bracers but, at level 1-5, there is a 50% chance it can be hide bracers, at level 6-18 it can be leather bracers and at level 19, it can be scaled bracers. Lastly, there is a 20% chance of him carrying a leveled shield, up to elven quality at level 12.
His weapon of choice is random and leveled as well (up to elven quality at level 22) and can be either a mace, a sword or a war axe. He also carries a bit of random loot, food and drink, with a slim chance of a lockpick and/or some gold.
Vidgrod's body, along with his two friends, is consumed by Halldir to make his three elemental copies during your fight with him.