Import the build.gradle in Intellij. Run the Gradle "setup" task in the mcp folder in IntelliJ - you may need to select View > Tool Windows > Gradle to get this option. This will generate the ...

Plugins: Minecraft, Minecraft Coder Pack, SpongeAPI, Sponge, Eagle Factions, GriefPrevention, Holograms, LuckPerms, Nucleus, PlaceholderAPI, ProjectCore ...