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At the moment, the amount of preparation you need for Skeletron compared to what you access after defeating it isn't worth it at all.
In exchange for fighting an unholy spinning skeleton wheel of death (looks like Red took some inspiration from FROM SOFTWARE) that shoots homing skills, you get...
copypasta'd from Terraria Online
OC pls donut steel
I'm really disappointed that there's no way to make a hardmode version of the Dark Lance, so I figured this would be the best route. Instead of dropping Broken Hero Swords, Mothron now drops the Hero Essence, at a 100% drop rate per kill. True...