The Calamity in Remnant.

You are a casual Terraria player, actually, you are one of the best Terraria players in America. And so when your Terraria Journey came to an end, you downloaded the TModLoader and began to play with some mods. Your favorite mods were the Calamity, Thorium, Nolefs, and the Glory Mod as well as some other quality of life mods. After you completed a hardcore, Revengeance, and DEATH run you go back to your first character, a testing dummy set on softcore named Y/N, and have some calm fun in the world. But soon a strange portal similar to the old one's army portal opens up, moreover, you can interact with it. When you toggle the portal in the game, you suddenly fall unconscious and wake up in a forest and to your surprise, you are in the same equipment as your character Y/N. Confused and scared, you realize you have been isekaied into a world that looks oddly familiar.

#1 in Terraria... How?