Grand Slam is a weapon action granted by 
Corpsegrinder.
Description
Slam your weapon into the ground, dealing additional 
Thunder damage equal to your proficiency bonus, thunderously impacting nearby foes and possibly pushing them away.
Properties
- Cost
Action- Damage
- Normal weapon damage
- + Proficiency bonusThunder damage
- Details
DEX Save
AoE: 3 m / 9.8 ft (Radius)
Recharge: Short rest
How to learn
Granted by the weapons:
Notes
- On save, targets take half damage.