There are two types of Attack: Melee and Projectile.

Use an Action to roll [ d6 + Melee or Projectile ] vs the target's Defense.

Rolling a 6 on the die is an Explosion, which is then re-rolled and added cumulatively to the Attack total.

Melee Attack can be a Called-Shot to any Location on the target's body at no penalty.

Projectile Attack must roll a random Location unless the Called-Shot Maneuver is declared.