Eye of Cthulhu
What new biome would you add
In the PC version you need an Orichalcum/Mythril anvil to craft it, and in the mobile/console versions it's not an issue because you can already get crystal shards anyway.Actually, the phasesaber would be craftable prehardmode if shards were available.
All it needs is a phaseblade + 50 crystal shards.
.An Autumn Forest biome with orange-red trees and leaves drifting through the air. Piles of leaves would generate randomly, and some of them would hop up and attack you with the Slime AI. They would be called 'Am-Bushes' :3