Here on StoneBreakers2 the piercing hit works differently. Every piercing hit deals additional damage that adds to your current hit or skill damage. You can apply piercing hits with your skills or hit attacks.

The damage scales with enemy HP. Deals additional damage equal to 0.66% enemy max HP.

Hit attacks can trigger a chain of lighting that damages multiple enemies.

The lighting damages scales from the attack that it was triggered by.

Lightning strikes can crit.

Lightning damage can be increased only by the corresponding affix bonus.

Fire is a DOT that burns the enemies and applies damage over time. You can apply burn with skills or hit attacks.

The burn damages scales with the enemy current HP. Deals damage equal to 1% of enemy current HP.

Burn damage can crit.

Burn damage can be increased only by the corresponding affix bonus.

Poison is a DOT that poisons the enemies and applies damage over time. You can apply poison with skills or hits attacks. Does not affect HP regen.

The poison damages scales with the enemy max. HP. Deals damage equal to 0.5% of enemy max HP.

Poison damage can be increased only by the corresponding affix bonus.

Bleed is a DOT that makes enemies bleed and applies damage over time. You can apply bleed with skills or hit attacks.

The bleed damages scales with the enemy current HP. Deals damage equal to 0.8% of enemy current HP.