TerrariaMod is a mod that attempts to port over as much content from the game Terraria into Minecraft. It adds several new things from the game including items, tools, and a few bosses.
Join the Terrariamod discord to see development progress and participate in polls for the mod here https://discord.gg/37rqPbU, and check my YouTube channel out for development previews here https://www.youtube.com/channel/UCIuLP8cttaRiArgewiclpiw.