Asteroidal_Assassin
Skeletron Prime
For me its the first time me and my brothers entered hardmode. In the fight with the wall of flesh my brother who was the last survivor died right after he took the final hit on it so we had to go back down and get it... We had to see all of the horrors of the crimson in immense detail. And cennxx confirmed that the floating gross is not a ghost I imagined it in hyper realism that has to be the only thing topping that Terraria related fear.