The Photon Blaster is an upgrader that is obtained from the Gatekeeper's second-last quest. It allows the player to attack mega bosses and their shields, as well as deal damage to ghosts and minibosses from greater distances by shooting balls from the player's vacuum or disruptor. If this ability is used in The Backdoor, it will take a small amount of charge from the battery, you could still shoot down the ghosts EVEN if your pack is full/battery is empty, but still gotta sell/recharge in order to finish the ghosts off. Do note that the projectile has a LIMITED range, the ghost mobs/boss/miniboss health when continuously shot will be limited to 1 UNTIL vacuumed/disrupted, blasting the bosses/minibosses/megabosses(4 shots for 1%) is less efficient than vacuuming up close(other than Final Boss) AND killing the megaboss by Photon Blaster WILL NOT GIVE ANY ECTOPLASM. Also, Accelerated Parts affect the Photon Blaster's fire speed by 2%, max 10%.
For total default pet vacuuming multiplier of A, default vacuuming/disruptor rate of B and C times of Pet Evolution selected, ghost mobs health goes down by if it hits. Additionally, in Backdoor, Battery Charge decreases by per shot fired even if it misses.