I want to double damage after adding conditions

[koucha]

Skript Version 2.2
Skript Author SkriptLang
Minecraft version 1.8

Code

on damage:
    victim isn't player
    name of victim contains "dark"
    set damage to damage * 2

No error will occur, but damage will not be reflected

 

[Drioz]

on damage:
    victim isn't player
    name of victim contains "dark"
    damage victim by damage * 2

 

[TPGamesNL]

Skript Version 2.2
Skript Author SkriptLang
Minecraft version 1.8

Code

on damage:
    victim isn't player
    name of victim contains "dark"
    set damage to damage * 2

No error will occur, but damage will not be reflected

Check if it's the condition which isn't working or the damage part

 

[koucha]

Check if it's the condition which isn't working or the damage part

Thank you"!!!!!!
[doublepost=1533723295,1533723253][/doublepost]

on damage:
    victim isn't player
    name of victim contains "dark"
    damage victim by damage * 2

Check if it's the condition which isn't working or the damage part

Thank You！！