Observer Ward

Observer Ward is an Item purchasable at the Main Shop, under Consumables. It produces an invisible Observer Ward to spy on an area, but does not have True Sight.

Absolutely essential to victory, Observer Wards allow you to keep watch over areas and spy on your enemies while keeping you and other heroes safe. It is important to keep wards up in key locations, and deny enemy wards.

Stacks with itself in inventory.

Additional Information
Observer Wards provide a large sight range of 1600 AoE around them and last for 6 minutes after being placed. However, they do not provide True Sight in this area. They are invisible to the other team. They are considered essential to map control, providing vision for Runes, watching out for Ganks, and blocking neutral creeps from spawning in the Jungle. Wards are one of the few items in the shop that have a limited stock.

Because of their usefulness, Observer Wards have a maximum stock of 2 sets in the store with each set containing 2 wards. The stock takes 6 minutes to replenish. Wards also have a limited stock in order to discourage overly defensive play. A common tactic used is to destroy the enemy team's wards using the True Sight provided by Sentry Wards or Gem of True Sight.