First Blade Shard: Left from the starting point is a ladder heading downward. Kill the Brass Snails and Drillerella, hop down pass the poison fumes, and open the supply crate at the end of the path for a Blade Shard.
Second Blade Shard: On the left side of the map is a supply crate sitting amongst a line of punji sticks that contains a Blade Shard. Obtaining the Shard requires the Kings to lose health jumping into the punji sticks.
Alternatively, the Blade Shard may be dropped by the Steel Soldier.