Current effect: Armor and Resistance is increased by 50 %.
My suggestion: While having Defence Up, Damage Taken from Physical and Special Attacks are reduced with 40 %.
This will benefit even low armor characters.
With Defence Up, a low armor character that normally would take 30.000 damage from an attack , would then take 18.000 instead.
Or keep the current Defence Up-buff as is, and add a new buff called Shield Up that reduces set amount of damage taken for the duration (or dispel).
0