I beat expert skeletron with regen, ironskin, endurance, swiftness, and wrath potions. I also used bowl of soup. I had platinum armor. My accessories were the worm scarf, spectre boots, magic carpet, band of regen and shark tooth necklace. I literally just used a really long platform. and I healed with regular healing potions, NOT lesser healing potions. My weapon was a demonic minishark with silver bullets
Well, you CAN make a house in the corruption, but it won't be valid housing for NPC's
I don't think spider nests generate in the jungle. I found mine in the forest underground and the snow underground.