Ice Scream

The Frost Moon summons with a Naughty Present (20 silk + 5 ectoplasm + 5 souls of fright) at night; wave 15 before dawn is the ask, and it's a stiffer DPS check than its pumpkin sibling Baleful Harvest. Endgame gear helps enormously - many come back post-Moon-Lord to brute-force it. Arena essentials: heart lanterns, campfires, honey, and burst damage for Ice Queens. Summon at the first tick of night.