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.

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 destroy enemy wards.

Stacks with itself and with sentry wards in inventory.

Additional information
Observer Wards provide a large sight range of 1600 AoE around them and last for 7 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 to discourage overly defensive play.

Observer Wards have an initial stock of 2 units in the store and a maximum stock of 4 units. Every 180 seconds, the stock is increased by one. Although it is common for the support to purchase wards, mid and off-laners can purchase them to set up ganks or block the enemy team's safe lane jungle camp respectively. 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. The wards can also be targeted by Quelling Blade and Tangoes to be destroyed instantly.