Baron Nashor

Baron Nashor, the most powerful minion, is supposed to be Roshan homologue in League of Legends. He appears on the Summoner's Rift Field of Justice.

Killing the Baron gives the "Exalted with Nashor" buff to all champions on the team that killed him. This buff gives massively increased attack damage and ability power. It also decreases cooldowns by a certain percent.

There was a tournament between the beta testers called Baron Nashor's Cup

Exalted with Baron Nashor
After the Baron Nashor is slain it gives to all alive players of the Team that killed the Baron a buff with the next attributes:
 * 40 Ability Power
 * 40 Damage
 * 3% increase in Health Regeneration
 * 15 increase in Mana Regeneration

As well as an instant:
 * 900 Experience Points
 * 250 Gold.

Trivia

 * When Nashor is spoke backwards, vocally it says Roshan; which is the biggest natural Creep in DotA.
 * If you read this that means you love League of Legends :D