What are Echostones

From Destructoid:

Kingdoms of Amalur: Reckoning demo item unlocks for Mass Effect 3:

• Reckoner Knight Armor: This armor will maximize damage done in close-quarters combat while a beefed–up power cell feeds energy into weapon systems to increase projectile velocity.
• The Chakram Launcher: This weapon uses a fabricator to manufacture lightweight, explosive ammunition discs. This weapon is earned after completing the Reckoning demo and watching the trailer at the end.

Mass Effect 3 demo item unlocks for Kingdoms of Amalur: Reckoning:

• N7 Armor: Players can unlock special armor inspired by Commander Shepard’s iconic N7 battle armor including Helm, Cuirass, Gauntlets, Chausses and Greaves.
• Onmiblade Daggers: A holographic blade stemming from Commander Shepard’s Omni-Tool, the Omni-blade allows players to stab enemies in close combat. Once players install and play the Mass Effect 3 demo, they will unlock the daggers.

Kingdoms of Amalur: Reckoning demo item unlocks for Kingdoms of Amalur: Reckoning:

• Twist of Fate Card: This card boosts the player’s ice resistance and is immediately unlocked when he or she activates the Reckoning demo using his or her Origin account.
• Twinned Souls Chakram: A unique weapon that damages enemies while boosting player health and mana in Reckoning.
• The Infernal Helm: Unlocked after completing the Reckoning Tutorial Mode, this protective helmet increases players’ fire damage throughout Amalur.

There are two ways that you can junk items.

• Click on the icon, not the name, of an item in your inventory and drag and drop it into the junk bag. If you try to drag and drop on the name instead of the icon, it doesn't drag.

• Right-click on an item in your inventory and select "Add to Junk".

These options only work if the item is unequipped.

Think of putting stuff in your junk bag as handy way of marking it as "sell this when I get back to town". When you talk to a shopkeeper, you have the option to sell everything in your junk bag.

You can view items in your junk bag by going to Inventory->Junk. You can remove items that you accidentally junked by viewing them in your junk bag, right-clicking, and selecting "Remove from Junk".

Also, when viewing items in your junk bag, you can select to destroy them, either individually by right-clicking and selecting "Destroy" or all together by selecting "Destroy All" at the bottom of the screen. You may find that you need to destroy some items if your inventory is getting because you're a greedy little thief like me who steals everything that isn't nailed down, even if you don't need it. After junking these stolen items, they may end up stuck in your junk bag because shopkeepers won't buy stolen goods. I assume there is a way to sell stolen items later in the game, but I haven't gotten that far yet.