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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 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.
Because of their usefulness, Observer Wards have an initial stock of 1 set in the store and a maximum stock of 2 sets, with each set containing 2 wards. The stock takes 6 minutes to replenish. 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.
 Balance changelog
- Duration increased from 6 to 7 minutes.
- Killing Observer Wards now grants a 50 gold bounty.
- Initial Stock now starts at 1 instead of 2 (max stock is still 2).
- Cost decreased from 200 to 150.