The Rage Potion is a vile concoction brewed by Alchemists, from various unsavoury animal parts. It is a thick bright red mixture, and when drunk causes violent mood swings and a marked increase of aggression in the drinker. For most people this just causes trouble, but warriors find this heightened state of anger of great use in their work.
Rage Potion is crafted by Alchemists with a skill level of 90.
This recipe is available from:
The comparative scarcity of Sharp Claws, and limited market (Warrior and Druid only), means that it doesn't often end up on the Auction House, and is expensive when it does. However, these potions are another good reason for the warrior to consider Herbalism/Alchemy instead of the traditional Mining/Blacksmithing combination for professions.
The rage amounts above may seem relatively small, compared to Mana Potions, but bear in mind that a warrior will always have a maximum rage of 100. Since the warrior usually starts combat with 0 rage, and gains rage quickly and often during a fight, these potions are best kept for when a warrior absolutely needs to get a large rage-cost special attack immediately; e.g. going from a standing start in a duel, or delivering massive DPS on an enemy who absolutely has to die now!
For day-to-day grinding, these potions should not be necessary, as the additional cost and effort of harvesting claws and fangs makes them much more costly than mana or health potions.