Giant Slayer

While others view the sling as the weakest of weapons, or even a child's toy, you have honed its use to the point of toppling behemoths. You gain proficiency with slings if you are not already proficient with them. In addition, when using a sling you gain the following benefits

• When you have advantage on a ranged attack with a sling, you add double your proficiency bonus for the attack roll.
• The range of your sling attacks increases to 60/240.
• When making an ranged attack with a sling against an enemy one or more size categories larger than you, your damage die increases by 1d4 for each size larger than you they are.
• When you make a sling attack against a creature with the "Giant" tag, your attack counts as magical for purposes of overcoming resistance and immunity.