Hello and good day Aternos Team and Forum Members, today i want to suggest a plugin for Spigot Minecraft Servers, this plugin is called: FallenKingdom (2.16.1). 
This plugin allows to play a PvP game pretty well knowned in France, and consists in team of 2 building fortresses and attacking other's fortresses
A plugin is useful for this game, to manage all the game and customize as you want, this plugin is very complete and is the best i could find for this mini-game.
I would be very grateful if you could add it, since I need it for a server project that I am planning.
INFO ABOUT THE PLUGIN:
Author: Etrenak
Plugin Version: 1.8.x - 1.12.x
Plugin Category: GameMod / Mini-Game
Spigot Link: https://www.spigotmc.org/resources/fallenkingdom.38878/