Fell Thunderbrute is located at the bottom of "The Elixer Well", an area that you maybe already be firmilar with from the demo. Just keep heading down deeper and deeper into the well. Once you see reach an dark large open cavern with a Shroud Root in the centre, you should see him standing to the right of it.
Hint: if your enter quietly he will have his back to you.

How to Fight Fell Thunderbrute
The Brute is as big and as ugly as they come. But once you get over his size. You'l find hes pretty slow, and even that huge melee weapon is pretty cumbersome.
He has a straight forward attack pattern, which is mainly a pretty large horizontal swing.
Depending on your armor, he deals about 36 damage points -/+5 depending on what your wearing, so posing a pretty big threat to new low ranking players at the start.
Obviously going toe to toe isnt in your interest here. You can stick to ranged weapons.
But we found fire and magic worked best here fire blasts / ice bolts. Check out our article on "Enshrouded: Weapons" for an upto date list of all the weapon types and arcane magic available at your finger tips.
Stick to the simple strategy of keep moving, stay out of his reach and avoid getting cornered, and you will make short work of this Boss.
Boss Rewards
As soon as the brute is down and your towering over his body. You get to loot the body. We got a legendary ranked axe, and trophy. Although, as this was done during the demo period, we arn't quite sure if the trophys are worth anything more, then putting on a shelf in your newly built stone enshrouded house.