Nomad is a boss with 10,000 (12,500; explain a bit below) and has two primary weapons. His first is a spell that can deal a damage between 1 - 300. His 2nd, which he shouldn't used until the end, is a spear with damage 1 - 250. His spear is like 10 times faster than normal and he can easily do like 5 hits in about 2 seconds so do not underestimate his melee attack. He also has scripted events! When his health drops below 8,000 he will place up mines in the area that will cast spells at you when you get near. His next event is when he is below 6,000 health, he will summon up 3 clones of himself (The clones only do 1-50 points of damage each and die in one hit. Also, activating a clone will make it vanish). He also has another event but this one is rarely done correctly, from my tests. What will happen is your controls will be disabled for a few seconds and he'll cast a spell that does up to 750 damage (One time only cast). Normally, he doesn't cast it and switches back to his normal spell. Strange, right?
After that, when he gets to 2,500 health, his health is reset up to 5,000/5,000 (Which gives him 2,500 more than the original 10,000 he had). The next time he reaches 2,500 health, his magicka will get set to 0 then he is force to use his melee attack. This part is normally the deadliest since there isn't any good hiding spots within his lair so you better be ready to dodge him and kill him.
If you do defeat him, you get his spear and whatever he was wearing.
Does that sum it all up for ya?