Imprisoned Dvergr
Dverger
What to know
Imprisoned Dvergr has 1,500 health.
Spirit does nothing to it at all. Blunt, slash and pierce land at full damage, so that is what to bring.
Its hardest hit is dverger arbalest shoot deep north at 250 pierce, out of 3 attacks.
Of everything craftable, 
Frostfire Crossbow, 
Thunderblood Crossbow and 
Lightning Strike put the most damage through what it resists.
It always drops 
Coins.
Spawn command
With devcommands enabled, this spawns Imprisoned Dvergr in front of you. The third number is the level: 3 spawns a 2-star.
Creature ID: DvergerDeepNorth · all console commands and IDs