Whenever the target is looking directly at the assassin, the assassin cannot move, place or dig blocks, or hit the target. This looking effect is blocked by blocks (except blocks you can walk through). For the assassin to win, all they have to do is punch the target once, while the target tries to win by causing the death of the ender dragon, thus completing Minecraft.
The assassin receives a compass that points to the target when clicked and they are both in the overworld, this helps them sneak up on the target, or find them if they've gone far away.​

The hunter can respawn any amount of times they require. For the hunter to win, all they have to do is kill target once, while the target tries to win by causing the ender dragon to die, thus completing Minecraft.
The hunter receives a compass that points to the target when clicked and they are both in the overworld, this helps them sneak up on the target, or find them if they've gone far away.​

/assassin mode <mode: assassin or manhunt>
/assassin assassins add <hunter/assassin player name>
/assassin target set <target player name>
/assassin start​

https://github.com/JorelAli/CommandAPI/releases/tag/6.5.3​

/assassin start: starts the plugin
/assassin stop: stops the plugin
/assassin status: determines whether the plugin is running or not
/assassin mode: returns the game mode, either assassin or manhunt
/assassin mode assassin: sets the game mode to assassin (default)
/assassin mode manhunt: sets the game mode to manhunt
/assassin assassins add <players>: adds the following players to the list of assassins/hunters
/assassin assassins remove <players>: removes the following players from the list of assassins/hunters
/assassin assassins list: lists the assassins/hunters in the game
/assassin assassins clear: removes all players from the list of assassins/hunters, including offline players
/assassin set freezeRange <freezeRange>: sets the freeze range for the assassin in blocks, default = 64
/assassin set enableCompass <compassBoolean>: sets whether the compass is enabled or not, default = true
/assassin query freezeRange: returns the current assassin freeze range
/assassin query enableCompass: returns whether compasses are enabled or not
/assassin target set <player>: sets the target
/assassin target query: returns the name of the target
/assassin target unset: unsets the target (default)​