The Critical Strike Multiplier is a passive skill that you can gain from the gameplay. It helps increase the physical damage. The Multiplier has recently grown from 8% to 12-15% based on your spell crit chance. When it grows, all the spells and attacks are affected by this. The multiplier is applicable to all damage types. How does it work? If you could do 100 physical damages and 10 cold damages, now you can do 250 physical damages and 25 cold damages.