Alter Density

Choose one willing creature or unattended object within range. For the duration, the target becomes lighter or heavier. A creature gains advantage on one Athletics or Acrobatics check involving carrying, jumping, climbing, resisting forced movement, or moving quietly. An object’s effective weight is halved or doubled.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.