You’ll need to talk to Andre the Blacksmith in Firelink Shrine if you want the reinforcements. Here’s a list of all the shards we’ve found so far:
Area: Firelink Shrine How to get: This shard is up on the arches near the ceiling of Firelink Shrine. You’ll need to buy the key from the Shrine Handmaiden for 20,000 souls. When you have the key, climb the stairs to the right, all the way to the top. Once outside, go to the tower, use the key and climb. Jump off the bridge to the roof, then onto the terrace on the far side. Enter the shrine again, and walk the arcs to get to the item.
Area: Undead Settlement How to get: This one is next to the pyre in the middle of the village, the one with a bunch of burning bodies and a dozen enemies around it, next to the big tree. You don’t need to kill them all to get it – just draw them away from the fire, then run to it and snatch the item.
Area: Farron Keep How to get: Go to the collapsed tower in the middle of the marsh – you’ll see a fire burning nearby. The shard is on a body next to the tower.