You've learned to fell giants with a single stone. When wielding a sling, you gain the following benefits:

Increase the sling's damage die to 1d6

You may load and fire a sling without needing a free hand.

After successfully striking a target with your sling, you may cause the stone to ricochet. Make a second attack against a target within 10ft of the original; on a hit, you deal damage equal to your Dexterity modifier.