This is the first tier grieves in the DragonRealm mod. It is crafted using Dragon Ingots similar to the vanilla leggings recipe.
To upgrade this item to the Scout Dragon Grieves, you must first learn the Scout Knowledge Tome achievement and have created the Dragon Altar. Place the Dragon Altar on the ground and, while holding the Dragon Grieves in your hand, Right-Click the Dragon Grieves on the Dragon Alter. You should hear a Dragon Growl and Thunderclap if successful.
Note: The Dragon Grieves must have full durability (not damaged) before the upgrade can occur. You can repair it with Dragon Ingots in an anvil. Also... you will loose all enchantments that may have been placed on the Dragon Grieves during the upgrade.
A debuff will be applied to you if you are holding this item without having first earned the First Blood achievement. The debuff is Mining Fatigue II and Slowness IV.