It's been 5 years... a lot has changed since then. But I thought I would up finally update this plugin and give more server owners the glory of trolling their players.

Changes:
- Complete overhaul of the plugin
- Updated plugin to be compatible with 1.8 - 1.13.2
- Changed formatting of commands (see description)
- Added customisation via config.yml

Command list (in no particular order):

/na op <player>
Makes player think they have OP

/na deop <player>
Makes player think they have had their OP removed

/na join <fakename>
Simulates a fake player joining the game

/na leave <fakename>
Simulates a fake player leaving the game

/na mob <player> <mob> <amount>
Spawns a specific entity/mob onto the player. You can also define how many you want to spawn.

/na effect <player> <effect> <duration>
Add a potion effect to a player. You can also define how long you want the effect to last.

/na launch <player>
Launches a target player into the air straight to their death!

/na explode <player> <strength>
Creates an explosion around a target player. You can also choose the strength of the explosion (regular TNT is 4.0F)

/na msg <player> <message>
Makes a player say a specific message as if they have typed it themselves!

/na nuke <player>
Creates an enormous explosion around a specific player. Use with caution.

/na pyro <player> <duration>
Sets a player on fire. You can also configure the duration.

/na richkill <player>
Spawns tons of experience orbs, sets the player on fire and creates an normal explosion all at the same time.