Check out the level 1, 2 and the special attack from some weapons.
Level 1: It shoots one sword per shot.
Level 2: It shoots two swords per shot.
Special: It shoots a wave of swords.
Each hammer drops a bomb at the hit.
Level 1: It shoots one hammer per shot.
Level 2: It shoots one hammer per shot and split in two at the hit.
Special: It shoots simultaneously several indestructible hammers.