Proc Rune

Proc runes are special runes that automate the casting of spells when certain conditions are met.

There are currently 4 proc runes, which are:

Critical Hit Trigger Rune

Projectile Hit Trigger Rune

Melee Hit Trigger Rune

Procs when dealt damage Rune

How do they work exactly
A proc rune will modify the damage value of the skill it supports, and only of that skill. It will not affect any damage values outside of said skill, and it will not affect neither the strength nor the duration of buffs it supports.

Example of how it works
Say you have two identical Level 1 Fireball skills, and they both deal 100 Fire Damage.

You use both of them on a practice dummy, and you get a damage value of 100.

Now you equip one of them with a Level 1 Projectile Hit Trigger Rune.

You can only use one of the Fireballs, as the other one is now casted automatically only during certain conditions.

When you use the Fireball that you are able to, you still deal 100 damage.

When the Fireball you have equipped with the proc rune is casted, it will deal 50 damage.