Just started a modded terraria server. If anyone wants to join:
>Install tModLoader
https://forums.terraria.org/index.php?threads/1-3-tmodloader-a-modding-api.23726/
>manually install Calamity Mod
http://www.mediafire.com/file/5dcd027hbjmp94j/CalamityModV1.1.7.948.zip
Just put it in
>Documents\My Games\Terraria\ModLoader\Mods
>IP
108.90.110.222:7777