Increase damage deal by the arrow (passive)
Lvl 1. 2% damage increase
Lvl 2. 4% damage increase
Lvl 3. 6% damage increase
Lvl 4. 8% damage increase and able to penetrate 1 time but have 40% less magical damage
Lvl 5. 10% damage increase and able to penetrate 1 time but have 40% less magical damage