You must installed MythicMobs to use this plugin.
This plugin will show the time remain about MythicMobs Spawners like that

Commands and Permission
Show Boss information(default will just show the mobs what only has Bossbar)
/mobtimer
show all boss time remaining inforamtion(Without Teleport)
Permission required:none

/mobtimer [mob name]
search the mobs what you specific(Fuzzy search)
Permission required:none

/mobtimer reload
reload the config.yml and language.properties
Permission required:[OP, mobtimer.reload]

Additional information display:


[teleport to respawn location]
Permission required: [OP, mobtimer.tp]
[Respawn this boss]
Permission required: [OP, mobtimer.tp]

And the PlaceholderAPI is also supported by the tags below:
%mobtimer_{spawner name}_cooldown%
%mobtimer_{spawner name}_warnUp%
%mobtimer_{spawner name}_respawnTime%
%mobtimer_{spawner name}_name%
%mobtimer_{spawner name}_blockX%
%mobtimer_{spawner name}_blockY%
%mobtimer_{spawner name}_blockZ%
%mobtimer_{spawner name}%

Configuration: