Stardust Guardian
Official Terrarian
I was gonna say "add sans undertale" But then I remembered.
Terraria GAME MOD Terratale v.1062018 - download
(its the terratale mod, But I reccomend downloading it from the tmodloader. Much easier. And can be combined with calamity + cala music mods to make it better. You can have sans as a final boss after supremey, since Sans does much more damage and can instantly 1 shot you even with melee auric armor)
Ouef
Terraria GAME MOD Terratale v.1062018 - download
(its the terratale mod, But I reccomend downloading it from the tmodloader. Much easier. And can be combined with calamity + cala music mods to make it better. You can have sans as a final boss after supremey, since Sans does much more damage and can instantly 1 shot you even with melee auric armor)
Ouef