From Brotato Wiki
Plank is a weapon that can be bought from Shop. Weapons are primary damage dealers and most Characters can hold up to 6 weapons.
Plank is a Melee Weapon. Melee weapon have two different attack types, thrust and swing, both are capable of hitting multiple enemies. Melee weapons' Range only increase or decrease by half the amount of your range stat. The attack speed of melee weapons depends on their range. Increasing the range slightly decreases the Attack Speed, but increases the area hit by the weapon. Negative range has the inverse effect.
Plank has the Weapon Class(es) of: Explosive, Elemental.
Weapons in the same class gain bonuses, and are more likely to be found in the Shop.
|Explosive||(2)+5% Explosive Size
(3)+10% Explosive Size
(4)+15% Explosive Size
(5)+20% Explosive Size
(6)+25% Explosive Size
|Elemental||(2)+1 Elemental Damage
(3)+2 Elemental Damage
(4)+3 Elemental Damage
(5)+4 Elemental Damage
(6)+5 Elemental Damage