The Warrior Stone (Skyrim)

The Warrior Stone is one of the first three Guardian Stones the Dragonborn can choose from.

Effect
The stone improves combat associated skills 20% faster. The Warrior skills are:
 * Block
 * Heavy Armor
 * One-Handed
 * Smithing
 * Two-Handed

Location
After completing Unbound, continue to follow either Ralof or Hadvar and they will lead you to it. It is located southwest of Riverwood, and north-northwest of Helgen close to the river.

The Mage Stone and The Thief Stone can be found at the same place.

Trivia
Despite Archery falling under The Warrior skill set, it is counted as a stealth skill and covered by The Thief Stone in this instance only. It is unknown if this is intentional or a bug.