The Guthix bow has a special attack called Balanced Shot, which uses 55% adrenaline. It deals 150% weapon damage and heals the user the amount of damage dealt over time. When Guthix arrows are equipped, there's a chance to deal an extra 100% weapon damage (Earth spell damage), which also adds to the healing effect. The healing effect lasts for a minute and heals 10% of the damage dealt every 6 seconds.
The special attack is a combination of the special attacks of the Zamorak bow (dealing extra damage) and the Saradomin bow (healing over time). This explains why it is "balanced".
This bow also has a grip similar to a longbow which is midway between the Zamorak bow (which is a recurve bow and so has a very straight grip) and the Saradomin bow (which is very similar to a shortbow in appearance, with a curved grip), thus making it "balanced".