ATTACK_TYPE_NORMAL, DAMAGE_TYPE_NORMAL
that equals default wc3 spell damage. It will ignore all armor rating. It will not, however, ignore armor TYPE. To make it do 100% to all armor types, you would have to change the damage table, specifically for "Spell" damage in the Advanced -> Gameplay Constants window.
ATTACK_TYPE_NORMAL, DAMAGE_TYPE_UNIVERSAL
same as the first one except this one ignores magic immunity as well (think ultimate spells)