Fallen Warrior
Undead
What to know
Fallen Warrior has 750 health.
It takes extra damage from spirit; it resists blunt, slash, pierce and fire; poison does nothing to it at all.
Of everything craftable, 
Lightning Strike, 
Frostfire Crossbow and 
Frostfire Sledge put the most damage through what it resists.
Spawn command
With devcommands enabled, this spawns Fallen Warrior in front of you. The third number is the level: 3 spawns a 2-star.
Creature ID: FallenWarrior · all console commands and IDs