It's a weapon quirk. Each weapon has 3 hit combo. The last hit is a finisher. The spear finisher is a throw. You can not finish the combo and it will restart from the first hit after a while (to avoid throwing the spear) . With runes you get cool effects like:
- Lightning Finisher: you follow after it and release lightning.- Fire Finisher: you spawn fire circles all the way there .
This is a gif of both runes equipped.
