Features

• Create custom commands and link them to specified potion effects
• Admin command to give and remove effect
• Apply potion effects to a player upon their first join on the server
• Define the Potion Effects that will persist after the player's death
• Define a permission for the use of the custon commands you have created
• Set cooldown between each use to the custom commands
• Set the duration of the effects applied
• Fully configurable

Example with night vision (from config)

commands: [/nv, /nightvision, /night vision]
effects: [NIGHT_VISION 1]

Another example

commands: [/mysuper command]
effects: [REGENERATION 1, INCREASE_DAMAGE 2]
duration: 60
cooldown: 300
perm: my.custom.permission

Of course, you can create an infinite number of these with any commands and effects