Oh, he also wanted the attacks to ignore Armor VALUES (Such as 1 armor or 3 armor)...hmmmm
You can't directly do that, but there are a few workarounds:
1. Add some sort of armor reduction debuff to the units attack (Orb of Corruption) which is large enough (-20) to completely negate a units armor. I don't know if the first attack will do the full damage that you want (since the buff is not yet applied at that time), but the next attacks will actually do extra damage (I don't think you can ever set a unit's armor to flat 0 without complex triggers that keep track of every buff/debuff/item/pickup).
2. Try giving your unit 1 damage on its attack and have its damage come from auto-attack enhancing abilitites: Orb of Anihilation, Searing Arrows, Cold Arrows etc. I don't know if the damage from this abilities ignore armor, but they might since I believe they deal spell damage and spell damage ignores armor values.
The second solution would fit caster units.