I am planning to set up an AFK farm for various rare enemy drops and coins. My plan is to wall myself into a room surrounded by lava pits and maybe some traps on timers. I plan to wear clorophyte armor and a star veil to gain some automated attacks.
I plan to set these up at various biomes and am interested in knowing what enemies will be able to attack me though the walls.
I know that wraiths, meteor eyes, worms type enemies, man eaters/snatchers, and a lot of the dungeon monsters can.
I can avoid wraiths by making my structure float. I am not concerned about meteor eyes as I already have everything I need from them. Worms do not do a lot of damage to me and I think I can kill them fairly quickly even while AFK. I do not plan to do this in the jungle much so the man eaters are also not a concern.
Best Answer
I have put enemies under specific lists based on how they pose a threat to your property.
Enemies of Property
Zombies (come with demon eyes)
Possessed Armor
Goblin Sorcerer
Wraiths
Werewolfs
Clown
Eclipses
Can hit through Walls
Goblin Sorcerer
Wraiths
Damage Property
Can enter home without doors
Goblin Sorcerer
Vampires
Wraiths
Threats based on Time
Threats during Night
Wraiths
Possessed Armor
During Moons
Werewolves (Full Moon)
Clown (Blood Moon)
Solar Eclipses
The following are strategies from the wiki I have put what threats will remain after you have completed the follow concepts.
Strategies
Digging a Deep Pit
Threats Left: Sorcerer, Demon Eye, Worms
Suspension House
Threats left: Flying Monsters, Sorcerer, Worms, Bosses
To counter flying monsters its recommended to use platform traps and doors.
Advanced Approach
Threats Left: Demon Eyes
Sources
http://terraria.wikia.com/wiki/House_Defense