Guild Crafting

Overview
Guild augmentation is like enchanting your gear – you need specific gear that has a augment slot (tiny, small, medium and large) and the guild you are in is high enough to use that augment crystal(10, 25, 45 or 70). If you have the stuff needed you have to jump over to House Kundrak and find the suitable augment crystal vendor. Each size has its own vendor.

Once you purchase the right item and want to attach the crystal to your equipment item – head over to the Marketplace Stone of Change and stick them both in there and fire away. Soon the augmentation process will be complete and your item will have a stat/skill boost on it that stacks with everything.

The crystal will last for 6 hours after which it will disappear and you'll have to re-augment it (and re-buy the crystal as well). You can see the applied stat/skill boost in your character slot, usually marked as enhancement bonus. Note that the augment crystal bonuses don't stack – if you are wearing two items that both have a +power crystal in it – only the highest applies.

source - DDO daily

Randomly-generated loot can contain a Tiny/Small/Medium/Large Guild Augment Slot. Currently, items with a Guild Augment Slot cannot be used at all unless you are in a guild of the appropriate level to enable use of that size of slot. This will probably change so that if the Guild Augment Slot is not in-use, the minimum Guild Level restriction will not apply:
 * "May want to hold onto that. You might find you'll be able to use it much more easily soon, if the slot is empty." Eladrin 07-01-2010, 09:27 AM

Tiny (Minimum Guild Level 10)

 * Crystal of Accuracy: +1 Guild bonus to attack [weapons]
 * Crystal of Acid Resistance: +2 Guild bonus to Acid Resistance [armor] [shield]
 * Crystal of Balance: +1 Guild bonus to Balance [belt]
 * Crystal of Bluffing: +1 Guild bonus to Bluff [ring]
 * Crystal of Cold Resistance: +2 Guild bonus to Cold Resistance [armor] [shield]
 * Crystal of Concentration: +1 Guild bonus to Concentration [headgear]
 * Crystal of Corrosion: +1 Acid damage per hit [weapon]
 * Crystal of Diplomacy: +1 Guild bonus to Diplomacy [cloak]
 * Crystal of Disabling: +1 Guild bonus to Disable Device [gloves]
 * Crystal of Electric Resistance: +2 Guild bonus to Electric Resistance [armor] [shield]
 * Crystal of Embers: +1 Fire damage per hit [weapon]
 * Crystal of Fire Resistance: +2 Guild bonus to Fire Resistance [armor] [shield]
 * Crystal of Frost: +1 Cold damage per hit [weapon]
 * Crystal of Haggling: +1 Guild bonus to Haggle [necklace]
 * Crystal of Healing: +1 Guild bonus to Heal [belt]
 * Crystal of Health: +5 stacking maximum HP [all except weapon, armor, and shield]
 * Crystal of Hiding: +1 Guild bonus to Hide [cloak]
 * Crystal of Intimidating: +1 Guild bonus to Intimidate [armor] [shield]
 * Crystal of Jumping: +1 Guild bonus to Jump [boots]
 * Crystal of Listening: +1 Guild bonus to Listen [headgear]
 * Crystal of Opening: +1 Guild bonus to Open Lock [glove]
 * Crystal of Performing: +1 Guild bonus to Perform [necklace]
 * Crystal of Power: +20 stacking maximum SP [all except weapon, armor, and shield]
 * Crystal of Reaction: +1 Guild bonus to Reflex Save vs Traps [all except weapon, armor, and shield]
 * Crystal of Repairing: +1 Guild bonus to Repair [armor] [shield]
 * Crystal of Resilience: +1 Guild bonus to Fortitude Save vs Poison [all except weapon, armor, and shield]
 * Crystal of Searching: +1 Guild bonus to Search [goggle]
 * Crystal of Seeking: +1 Guild bonus to confirm critical [weapon]
 * Crystal of Shielding: +5% Guild bonus to Fortification [armor] [shield]
 * Crystal of Silence: +1 Guild bonus to Move Silently [boots]
 * Crystal of Sonic Resistance: +2 Guild bonus to Sonic Resistance [armor] [shield]
 * Crystal of Sparks: +1 Electric damage per hit [weapon]
 * Crystal of Spotting: +1 Guild bonus to Spot [goggle]
 * Crystal of Swimming: +1 Guild bonus to Swim [bracers]
 * Crystal of Tumbling: +1 Guild bonus to Tumble [bracers]
 * Crystal of Willpower: +1 Guild Bonus to Will Save vs Fear [all except weapon, armor, and shield]

Small (Minimum Guild Level 25)

 * Crystal of Accuracy: +2 Guild bonus to attack [weapons]
 * Crystal of Acid Resistance: +4 Guild bonus to Acid Resistance [armor] [shield]
 * Crystal of Balance: +2 Guild bonus to Balance [belt]
 * Crystal of Bluffing: +2 Guild bonus to Bluff [ring]
 * Crystal of Cold Resistance: +4 Guild bonus to Cold Resistance [armor] [shield]
 * Crystal of Concentration: +2 Guild bonus to Concentration [headgear]
 * Crystal of Corrosion: +1d2 Acid damage per hit [weapon]
 * Crystal of Diplomacy: +2 Guild bonus to Diplomacy [cloak]
 * Crystal of Disabling: +2 Guild bonus to Disable Device [gloves]
 * Crystal of Electric Resistance: +4 Guild bonus to Electric Resistance [armor] [shield]
 * Crystal of Embers: +1d2 Fire damage per hit [weapon]
 * Crystal of Fire Resistance: +4 Guild bonus to Fire Resistance [armor] [shield]
 * Crystal of Frost: +1d2 Cold damage per hit [weapon]
 * Crystal of Haggling: +2 Guild bonus to Haggle [necklace]
 * Crystal of Healing: +2 Guild bonus to Heal [belt]
 * Crystal of Health: +10 stacking maximum HP [all except weapon, armor, and shield]
 * Crystal of Hiding: +2 Guild bonus to Hide [cloak]
 * Crystal of Intimidating: +2 Guild bonus to Intimidate [armor] [shield]
 * Crystal of Jumping: +2 Guild bonus to Jump [boots]
 * Crystal of Listening: +2 Guild bonus to Listen [headgear]
 * Crystal of Opening: +2 Guild bonus to Open Lock [glove]
 * Crystal of Performing: +2 Guild bonus to Perform [necklace]
 * Crystal of Power: +40 stacking maximum SP [all except weapon, armor, and shield]
 * Crystal of Reaction: +1 Guild bonus to Reflex Save vs Enchantments [all except weapon, armor, and shield]
 * Crystal of Repairing: +2 Guild bonus to Repair [armor] [shield]
 * Crystal of Resilience: +1 Guild bonus to Fortitude Save vs Disease [all except weapon, armor, and shield]
 * Crystal of Searching: +2 Guild bonus to Search [goggle]
 * Crystal of Seeking: +2 Guild bonus to confirm critical [weapon]
 * Crystal of Shielding: +10% Guild bonus to Fortification [armor] [shield]
 * Crystal of Silence: +2 Guild bonus to Move Silently [boots]
 * Crystal of Sonic Resistance: +4 Guild bonus to Sonic Resistance [armor] [shield]
 * Crystal of Sparks: +1d2 Electric damage per hit [weapon]
 * Crystal of Spotting: +2 Guild bonus to Spot [goggle]
 * Crystal of Swimming: +2 Guild bonus to Swim [bracers]
 * Crystal of Tumbling: +2 Guild bonus to Tumble [bracers]
 * Crystal of Willpower: +1 Guild Bonus to Will Save vs Paralysis [all except weapon, armor, and shield]

Medium (Minimum Guild Level 45)

 * Crystal of Accuracy: +3 Guild bonus to attack [weapons]
 * Crystal of Acid Resistance: +6 Guild bonus to Acid Resistance [armor] [shield]
 * Crystal of Balance: +3 Guild bonus to Balance [belt]
 * Crystal of Bluffing: +3 Guild bonus to Bluff [ring]
 * Crystal of Cold Resistance: +6 Guild bonus to Cold Resistance [armor] [shield]
 * Crystal of Concentration: +3 Guild bonus to Concentration [headgear]
 * Crystal of Corrosion: +1d3 Acid damage per hit [weapon]
 * Crystal of Diplomacy: +3 Guild bonus to Diplomacy [cloak]
 * Crystal of Disabling: +3 Guild bonus to Disable Device [gloves]
 * Crystal of Electric Resistance: +6 Guild bonus to Electric Resistance [armor] [shield]
 * Crystal of Embers: +1d3 Fire damage per hit [weapon]
 * Crystal of Fire Resistance: +6 Guild bonus to Fire Resistance [armor] [shield]
 * Crystal of Frost: +1d3 Cold damage per hit [weapon]
 * Crystal of Haggling: +3 Guild bonus to Haggle [necklace]
 * Crystal of Healing: +3 Guild bonus to Heal [belt]
 * Crystal of Health: +15 stacking maximum HP [all except weapon, armor, and shield]
 * Crystal of Hiding: +3 Guild bonus to Hide [cloak]
 * Crystal of Intimidating: +3 Guild bonus to Intimidate [armor] [shield]
 * Crystal of Jumping: +3 Guild bonus to Jump [boots]
 * Crystal of Listening: +3 Guild bonus to Listen [headgear]
 * Crystal of Opening: +3 Guild bonus to Open Lock [glove]
 * Crystal of Performing: +3 Guild bonus to Perform [necklace]
 * Crystal of Power: +60 stacking maximum SP [all except weapon, armor, and shield]
 * Crystal of Reaction: +1 Guild bonus to Reflex Save vs magic [all except weapon, armor, and shield]
 * Crystal of Repairing: +3 Guild bonus to Repair [armor] [shield]
 * Crystal of Resilience: +1 Guild bonus to Fortitude Save vs magic [all except weapon, armor, and shield]
 * Crystal of Searching: +3 Guild bonus to Search [goggle]
 * Crystal of Seeking: +1 Guild bonus to confirm critical and +1 to critical hit damage [weapon]
 * Crystal of Shielding: +15% Guild bonus to Fortification [armor] [shield]
 * Crystal of Silence: +3 Guild bonus to Move Silently [boots]
 * Crystal of Sonic Resistance: +6 Guild bonus to Sonic Resistance [armor] [shield]
 * Crystal of Sparks: +1d3 Electric damage per hit [weapon]
 * Crystal of Spotting: +3 Guild bonus to Spot [goggle]
 * Crystal of Swimming: +3 Guild bonus to Swim [bracers]
 * Crystal of Tumbling: +3 Guild bonus to Tumble [bracers]
 * Crystal of Willpower: +1 Guild Bonus to Will Save vs magic [all except weapon, armor, and shield]

Large (Minimum Guild Level 70)

 * Crystal of Accuracy: +4 Guild bonus to attack [weapons]
 * Crystal of Acid Resistance: +8 Guild bonus to Acid Resistance [armor] [shield]
 * Crystal of Balance: +4 Guild bonus to Balance [belt]
 * Crystal of Bluffing: +4 Guild bonus to Bluff [ring]
 * Crystal of Cold Resistance: +8 Guild bonus to Cold Resistance [armor] [shield]
 * Crystal of Concentration: +4 Guild bonus to Concentration [headgear]
 * Crystal of Corrosion: +1d4 Acid damage per hit [weapon]
 * Crystal of Diplomacy: +4 Guild bonus to Diplomacy [cloak]
 * Crystal of Disabling: +4 Guild bonus to Disable Device [gloves]
 * Crystal of Electric Resistance: +8 Guild bonus to Electric Resistance [armor] [shield]
 * Crystal of Embers: +1d4 Fire damage per hit [weapon]
 * Crystal of Fire Resistance: +8 Guild bonus to Fire Resistance [armor] [shield]
 * Crystal of Frost: +1d4 Cold damage per hit [weapon]
 * Crystal of Haggling: +4 Guild bonus to Haggle [necklace]
 * Crystal of Healing: +4 Guild bonus to Heal [belt]
 * Crystal of Health: +20 stacking maximum HP [all except weapon, armor, and shield]
 * Crystal of Hiding: +4 Guild bonus to Hide [cloak]
 * Crystal of Intimidating: +4 Guild bonus to Intimidate [armor] [shield]
 * Crystal of Jumping: +4 Guild bonus to Jump [boots]
 * Crystal of Listening: +4 Guild bonus to Listen [headgear]
 * Crystal of Opening: +4 Guild bonus to Open Lock [glove]
 * Crystal of Performing: +4 Guild bonus to Perform [necklace]
 * Crystal of Power: +80 stacking maximum SP [all except weapon, armor, and shield]
 * Crystal of Reaction: +1 Guild bonus to Reflex Save [all except weapon, armor, and shield]
 * Crystal of Repairing: +4 Guild bonus to Repair [armor] [shield]
 * Crystal of Resilience: +1 Guild bonus to Fortitude Save [all except weapon, armor, and shield]
 * Crystal of Searching: +4 Guild bonus to Search [goggle]
 * Crystal of Seeking: +2 Guild bonus to confirm critical and +2 to critical hit damage [weapon]
 * Crystal of Shielding: +20% Guild bonus to Fortification [armor] [shield]
 * Crystal of Silence: +4 Guild bonus to Move Silently [boots]
 * Crystal of Sonic Resistance: +8 Guild bonus to Sonic Resistance [armor] [shield]
 * Crystal of Sparks: +1d4 Electric damage per hit [weapon]
 * Crystal of Spotting: +4 Guild bonus to Spot [goggle]
 * Crystal of Swimming: +4 Guild bonus to Swim [bracers]
 * Crystal of Tumbling: +4 Guild bonus to Tumble [bracers]
 * Crystal of Willpower: +1 Guild Bonus to Will Save [all except weapon, armor, and shield]