The river runs red. or green or purple. Starting at Battle Level 85, you'll receive mystical River Vials that allow your hero to change the substance and color of the river for everyone in the game. A vial can be equipped by claiming it from the in-game shop and cannot be applied to an already-modified river. As you level up, you'll gain access to new types of Vials as well as recharging your stock of previous Vials. Each vial comes with ten charges that last ten minutes each. The ultimate Vial, which turns the river into Blood, is available at level 2500 and comes with 50 charges..