Level 1 Mob
Level 1 Training Dummy
After it procs weakened armor, the numbers go negative.
Level 27 Mob, with Juggernaut 5.
Against a level 1 player. This did not kill him, he remained at 100% hp.
Level 1 player after weakened armor, this did kill him.
Video of the damage against a level 1 player
https://www.youtube.com/watch?v=7JXinPGQblA
Also, Str/Con buff on the Dread Archer reduces its damage significantly. Str buff does not lower damage, Con buff does not lower damage. Against a level 50 training dummy, the damage goes down from 173 to 139 with Str/Con buff.