TL;DR
Temporarily boosts all allied heroes' Attack Rating and Crit Rating, with bonus starting energy for faster activation.
Grassy Orb directs airflow and increases all allied heroes' Attack Rating by 10% and Crit Rating by 10 points for 6 seconds, with the Attack Rating increase not exceeding 20% of Grassy Orb's Attack Rating.
Lv 6 Ground Rustle's buff effect is boosted, increasing all allied heroes' Attack Rating by 15% and Crit Rating by 15 points, with the Attack Rating increase not exceeding 30% of Grassy Orb's Attack Rating.
Lv 12 At the start of a battle, Grassy Orb receives several points of beast energy.
Lv 18 Ground Rustle's buff effect is boosted, increasing all allied heroes' Attack Rating by 20% and Crit Rating by 20 points, with the Attack Rating increase not exceeding 40% of Grassy Orb's Attack Rating.