Board Thread:New on Terraria Wiki/@comment-80.189.35.252-20130403161054/@comment-90.185.80.202-20130404205730

go into the underworld and get the Demon Scythe. it drops from demons btw.

when he spawns/summons just spam the spell, he will drop hearts and mana for you to just stand there and be awesome, tested it even without armor, super easy but if your still unsure get some kind of armor.....

oh, and before you go and kill him have about 4 free inventory spaces for the loot.

hoped this helps.