Welcome to MCSM Redefined a modpack based on MCSM including Crackers witherstorm mod and Ultimate Eversource. With over 150 mods including new biomes, the aether, ad astra and so many more. Quality of life mods and many dimensions, Aether, The Outer End, Voidscape, and Twilight Forest.
For the witherstorm in survival you want to craft command block crafting tables and set the machine below to create a command block. and summon the witherstorm. and there are so many different weapons derived from this mod. Use JEI to find recipes.

For Ultimate Eversource you want to find the structure complete the puzzle and loot the enchanted flint and steel. light the portal and find the eversource. theres only one eversource per world but if you kill the eversource on accident it drops its crown and you can right click on a chicken to crown a new eversource
I dont want to spoil too much but i would enjoy if you played and tell me what you think.
also this includes proximity chat if you wanna use that w friends
+ultamine
enjoy!