Broken Armor debuff, and Giant Bats. Starting off with Giant Bats, they just do too much damage, even when you have a lot of defense. I have a full Mythril set (41 defense) and still take around 50-70 damage. I think they should just do around 20-40. Broken Armor debuff is just way too long, 5 minutes of your defense cut in half. Really a pain when you don't have an Adamantite/Hallow set. These are just my opinions. If you disagree with me, that's alright. These are my thoughts on these things and I really think they need to be balanced.