If you want the formula written out, here it is:
(((Weapon Damage * Impact Zone Bonus * Combo Bonus * (1 + Power Bonus)) + Additional Physical Damage) * (1 + Hit Location Bonus) * (1 Damage Reduction) * (1 Projectile Reduction)) + True Damage
I forgot to include Impact Zone and Combo bonuses. Think of Impact Zone as your sweet/sourspots on your weapon, and Combo as the bonus damage your weapon gets for latter hits in the combo. These only multiply Weapon Damage, same as Power Bonus.
Formula is same for Magical Damage, just substitute the words "Weapon" and "Physical" with "Magical".
The only time Combo and Impact Zone apply to Magical Damage is if it's the Crystal Sword's special "Magical Weapon Damage".

(Not like you'd know your enemy's damage reduction until after one of you is already dead, but that's a topic for another time.)

Check out the Dark and Darker Wiki: https://darkanddarker.wiki.spellsandg...