Observer was a summoner spell only available to Riot Games Inc. staff. Upon activation, the fog of war is cleared and all units may be seen. This effect only applies to the user who activated the spell.
Observer is no longer available in any realm, instead replaced by Spectator Mode.
- Observer was used by David 'Phreak' Turley to record the Ionia vs. Noxus match. A demonstration of the spell's effects during the match can be see here.
- A similar system was used on the World Cyber Gaming 2010 to record the finale.
- If an enemy uses , the Observer loses vision for the duration.
- In the old league client, a figure strongly resembling the man in Observer's icon can be seen on the default summoner profile.