I got a jungle key, it contains the piranha gun, it fires a projectile that latches onto an enemy for continuous damage, and after killing it, will seek out another enemy within range, presumably infinitely as long as there are enemies in range and I hold down the fire button
the nights edge requires four different swords and the excalibur requires killing goddamn hardcore bosses
combine them with the Broken Hero's Sword (that is a rare drop from ultra-motherforgeter hard enemies that only show up during a rare solar eclipse) and you get TRUE NIGHT'S EDGE and TRUE EXCALIBUR
fuse them both together with a third helping of Broken Hero's Sword and you get the terra blade
hopefully that cleared it up
You made it sound a lot harder than it really is
The Excalibur is a
ton easier to get than in 1.1 - All hallowed gear is crafted from hallowed bars that drop in fairly large amounts from the three basic hardmode bossed, instead of having to craft cobalt, mithril, and adamantite pieces of the gear together with a specific soul.
The solar eclipse mobs are only a challenge with basic gear, once you get even intermediate hardmode gear they're pretty easy. The drop rate is still low though