Power rune:

A power rune is a special rune that appears at the river in Dota 2 and gives the hero who picks it up a temporary bonus effect. These runes are a major source of lane pressure, gank setups, and objective control because they can immediately swing a fight or help a mid laner move around the map.

Common power runes include effects such as invisibility, haste, regeneration, double damage, illusion, and arcane-style spell benefits. Securing a power rune often decides early skirmishes and helps teams contest the mid lane and nearby river area.