"Pippin found that Shadowfax had been well housed and tended. For in the sixth circle, outside the walls of the citadel, there were some fair stables where a few swift horses were kept, hard by the lodgings of the errand-riders of the Lord..."
Upgrade Building to Level 2 - Grants level 2; gives +1500 HP and +20% build speed; unlocks new units or upgrades. Cost: 400
Upgrade Building to Level 3 - Grants level 3; gives +1500 HP and +30% build speed; unlocks new units or upgrades. Cost: 600
The Stable contains the following research which can then be bought by the Knights:
Knight Shield - Increases armor of the battalion against Pikemen by 25% and armor against Swordsmen by 50%. Changes the armorset to EdainCavalryShieldArmor, if heavy armor has already been purchased changes the armorset to EdainCavalryHeavyShieldArmor. Cost: 200