This is the Fogtools PLUGIN for PAPER - SPIGOT
With this plugin you can set custom fog to players or @a, also it only works with OP permission level.
Server Commands:
/fogtoolsplugin set (player/@a) (radius) (density) (color) (sky) (opacity) (fade in) (fade out)
/fogtoolsplugin gradient (player/@a) (gradientshape) (radius) (density) (topcolor) (centercolor) (bottomcolor) (sky) (opacity) (fade in) (fade out)
/fogtoolsplugin clear (player/@a)
Also it have a new command that only work on servers!
BIOME COMMANDS:
/fogtoolsplugin biome (gradient/set/clear/list) (biome) (....)
Biome commands work so that if a player enters or leaves a specific biome, a fog is automatically placed on them.