Bloodlust

Bloodlust is a shaman buff. The Alliance version is Heroism, and the Horde version is Bloodlust. They are exactly the same aside from their name.

Lore
Bloodlust is defined as "a strong desire for bloodshed."

Bloodlust is a spell that increases a creature's size, strength, and attack speed. Appeared in Warcraft II and III.

According to the RPG, Bloodlust requires a drop of blood mixed with earth to cast.

Talents

 * Mental Quickness

Tactics

 * The most common use for Bloodlust is during bosses in raids. When it is used varies from boss to boss and guild to guild, but usually at the last 25% of the boss.. When soloing, it can be useful for crunch situations or tougher mobs, such as targets for group quests.
 * As part of Blizzard's new movement toward "bring a player, not a class" raid compositions, Cataclysm will endow mages with a similar effect, Time Warp. Additionally, Beast Mastery Hunters with Core hound pets will be able to cast Ancient Hysteria, which functions similarly to Bloodlust.
 * When Bloodlust is used in raids, it is usually good idea to dump all other CDs you have (Avenging Wrath, Rapid Fire, Arcane Power...) at the same time, because in many cases it will result higher overall damage than using the cooldowns separately.