Trouble making a fireball deal 0 damage to player but 15 damage to other mobs

[Cynacol]

As the title says, I am trying to make it so that a fireball will deal 0 damage or hearts to players, but 15 hearts to other mobs. I have no addons installed and here is the code for the on damage event

on damage:
    event-projectile is set:
        event-projectile is a lightning:
            attacker's tool is enchanted book named "&6&lFireball Spellbook":
                victim is a player
                cancel event
                victim is not a player
                damage the victim by 15 hearts

:

 

[ViperX]

maybe?

on damage:
    if projectile is set:
        if projectile is a fireball:
            if name of attacker's tool is "&6&lFireball Spellbook":
                if victim is a player:
                    cancel event
                else:
                    set damage to 15

for me its working if not working please send the output of your /skript info

 

[Bit]

if victim is a player:
    cancel event
if victim is not a player:
    damage the victim by 15 hearts

Try this

 

[ViperX]

don't use

damage the victim by 15 hearts

if you doing a game that give the player kills etc... because this damage is not a player damage but you can use both

set damage to 15

and

make player damage victim by 15 hearts