All Pet Passives Level 41+

[Jairus980]

does hero fen passive and toor aa stacks? -35%armor

Debuff armor never stacks. its always the best debuff armor
if you have pet debuff 20% but war axe throw is 25%, then enemy will receive 25% debuff armor

[slaaayerrr]

No the % don't stack. The higest Armor Reduction will be the one applied to enemy or enemies.

Debuff armor never stacks. its always the best debuff armor

duskbringer staff's proc (20% armor reduce) is stacking with everything
duskbringer claymore passive reduce its owner's armor 30%, but other armor reduce things still reduce armor more (even if that claymore's debuff is highest)