How can I make spells ignore the damage reduction from armor?

[Boar]

Eg, 203 armor is 93% damage reduction, I do not want spells to be effected by this.

 

[nerovesper]

Make spell deal chaos damage + divine type

 

[Meticulous]

Spells already ignore armor value. They're only reduced by spell damage reduction (from the Runed Bracers item or abilities based on it) and armor type. By default, hero and divine armor types reduce spell damage. You can change this in gameplay constants.

As far as I know the only way to deal damage that is reduced by NOTHING - truly pure damage - is to alter the unit's health directly with triggers. You can perform a check to see if the health reduction would kill the target (greater than their current health), and if so, instead set the target's health to 1 and deal 10000 damage of attack type spell and damage type universal (overkill in even the most extreme circumstances). Spell damage is reduced by spell damage reduction even if the damage type is universal, but it will damage magic immune and ethereal units; physical damage will not damage ethereal units even if the damage type is universal; magic damage will not damage magic immune units even if the damage type is universal.