Based on an old map I've made, Grimlock ported this awhile ago so I'm re uploading it with some tweaks to it.
The sky moves.
There are two water variants. One normal, one harmful.
Sky_NightmareWater_NightmareNow the default options are different from what I have in my server. If you want the same effect I have here are my custom options.
$EnvGuiServer::SimpleMode 0
$EnvGuiServer::SkyFile Add-Ons/Sky_Nightmare/nightmare.dml
$EnvGuiServer::WaterFile Add-Ons/Water_Nightmare/nightmare.water
$EnvGuiServer::GroundFile Add-Ons/Ground_Plate/plate.ground
$EnvGuiServer::SunFlareTopTexture base/lighting/corona.png
$EnvGuiServer::SunFlareBottomTexture base/lighting/corona.png
$EnvGuiServer::DayOffset 0.707692
$EnvGuiServer::DayLength 100
$EnvGuiServer::DayCycleEnabled 0
$EnvGuiServer::DayCycle Add-Ons/DayCycle_Default/default.daycycle
$EnvGuiServer::Sunational socialistmuth 147.692
$EnvGuiServer::SunElevation 107.949
$EnvGuiServer::DirectLightColor 0.443925 0.434579 0.443925 1.000000
$EnvGuiServer::AmbientLightColor 0.168224 0.172897 0.168224 1.000000
$EnvGuiServer::ShadowColor 0.186916 0.186916 0.182243 1.000000
$EnvGuiServer::SunFlareColor 1.000000 1.000000 1.000000 1.000000
$EnvGuiServer::SunFlareSize 0.282051
$EnvGuiServer::VisibleDistance 1000
$EnvGuiServer::FogDistance 1000
$EnvGuiServer::FogHeight
$EnvGuiServer::FogColor 0.000000 0.000000 0.000000 1.000000
$EnvGuiServer::WaterColor 1.000000 1.000000 1.000000 0.691589
$EnvGuiServer::WaterHeight 4.61539
$EnvGuiServer::UnderWaterColor 0.000000 0.000000 0.000000 1.000000
$EnvGuiServer::SkyColor 0.000000 0.000000 0.000000 1.000000
$EnvGuiServer::WaterScrollX -0.909091
$EnvGuiServer::WaterScrollY 0.909091
$EnvGuiServer::GroundColor 0.000000 0.686916 0.500000 1.000000
$EnvGuiServer::GroundScrollX 0
$EnvGuiServer::GroundScrollY 0
$EnvGuiServer::VignetteMultiply 0
$EnvGuiServer::VignetteColor 0.000000 0.000000 0.000000 0.000000