New version should be ready soon (sorry), and will provide complete v1.14 compatibility.
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This plugin prevents your players from entering specified regions while in combat, displaying a visual barrier of blocks to them only around nearby protected regions.
This plugin can support an unlimited amount of regions, each of which has customizable settings such as barrier materials or patterns, display distance, and a few more to come shortly. There's also a main configuration file which contains many different modifiable attributes, as well as a language configuration file, where you can modify or remove the messages displayed to players (includes color support). The plugin also contains a simple anti-spawn-killing mechanism to prevent players damaging others inside of the set up regions (just in case you don't have a plugin for that).
Please be aware that this plugin currently does not contain any combat-blocking features (PVP logging, command blocking, etc) - You will need a separate plugin for this. There are many free ones out there that do this though.
Sorry, I haven't got a server set up right now. Please check the videos below for a more in-depth overview.