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Any of the old addon will not work with this version of duels.
Duels provides a simple 1v1 system optimized for factions & kitpvp servers. With a gigantic list of features for you to choose, this plugin will allow your players to have a battle to determine the true skill.
With the Extensions System, you can easily add extra features such as Auto Resetting Arenas, Hologram Leaderboards, and Placeholders to Duels. Simply download an extension, drop it in plugins/Duels/extensions/ folder, and start your server.
!bstats status

Duels Optimized | Fork of Duels plugin but optimized and added feature