Baron Nashor

Baron Nashor is the most powerful neutral monster on Summoner's Rift in League of Legends. He is also supposedly a tribute to Roshan, (his name being an anagram of Roshan) a monster filling a similar role in Defence of the Ancients.

It's described in game as follow: "This is a very powerful hostile monster, approach with caution! Killing this monster will yield great monetary and magical rewards to the team, but it should not be confronted alone".

Killing the Baron gives the buff to all living champions on the team. This buff gives massively increased attack damage and ability power as well as a bonus in health and mana regeneration. When Nashor is killed, each player on the team is also granted the following:
 * 900 Experience Points
 * 300 Gold

Lore
The Journal of Justice clarifies this about Baron Nashor :

''The many neutral monsters on the Fields of Justice are constructs inspired by real creatures from Runeterra. The Baron Nashor you see on the map is actually an incomplete facsimile of the true Baron Nashor, who is now the subject of myth and legend. The story goes that Baron Nashor was a ferocious worm that ruled the Serpentine River, which flows through Summoner’s Rift. He was such a fearsome and powerful beast that even the armies of Demacia and Noxus steered clear of the river, unwilling to chance an encounter with the Baron.''

''When Summoner’s Rift was constructed, the Baron vanished, leaving no conclusive evidence as to where he went or why he left in the first place. Obviously the rumor-mill has churned out many explanations, but all we know for sure is that the Senior Arcane Architect for the Summoner’s Rift arena was said to have crafted the version you see today from no more than a molted scale and interviews with those who had seen the beast and lived.''

Appearance
He appears after 15 minutes on the Summoner's Rift Field of Justice, and gains additional maximum health every minute he is alive. He is very difficult to take down without a full team unless in the later stages of the game (average player lvl ~13+) and next to impossible to solo due to his 'Wrath of the Ancients' ability which increases damage dealt by him for each stack on the champion.

During the Snowdown Showdown 2010 event, Baron Nashor wore three Santa hats, one for each of his three faces.

History updates

 * V1.0.0.108:
 * Base health increased to 8000 from 6500.
 * Magic resistance increased to 70 from 35.
 * Damage increased by approximately 15%.
 * V1.0.0.109:
 * Baron's Wrath of the Ancients spell no longer targets stealthed units.