Strong Back [Core d20 RPG]

The things you bear are more important than the body that bears them. You gain the following benefits:

• Increase your Strength or Constitution score by 1, to a maximum of 20.
• You count as if you were one size category larger for the purpose of determining your carrying capacity.
• You have advantage on Strength (Athletics) checks made to push, lift, or pull objects.
• You have advantage on Strength (Athletics) checks made to shove a creature.

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Source: Palant Guide to Exploration, Core d20 RPG