The Frost Moon is an event only at Christmas. You have to collect a naughty present from an enemy. Then at night tap on the naughty present(which should be in your hot bar) and the frost moon will spawn. It is like a pumpkin moon except that the enemies are christmas themed and they are mostly bosses. There is this awesome magic staff that you can use, that does TONS and TONS of damage, but it uses up mana(so bring mana potions). I found out about this staff by watching a YouTube video called 'frost moon, by Yrimir'. The enemies drop great stuff too.
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Boss guide for Terraria
عشوائيA guide to defeating the bosses it terraria. it took ages. I hope you enjoy my first book ever. =)