Please bump this a lot so it stays near the top so we don't have to see the same question asked every 10 minutes. I will list how they drop independently first, but will explain the rest afterwards.
This is how loot works in crota's end.
Normal
abyss chest drops materials
The abyss has the chance to drop armor or materials
The bridge has the chance to drop armor or materials
The thrallway is materials only
The deathsinger has the chance to drop materials or exotics (i think class items as well now)
Crota has the chance to drop materials, a helmet, swordbreaker, song of ir yut, light of the abyss, black hammer, hunger of crota, shader, and exotics
HARD
abyss chest drops double materials
The abyss has a chance to drop double materials and the oversoul edict
The bridge has a chance to drop double materials and the abyss defiant
The thrallway will drop double materials
Deathsinger has the chance to drop double materials and exotics
Crota has a chance to drop materials, the graverobber, the hard raid ship (forgot name), fang of ir yut, word of crota, shader, crux of crota, and exotics
THIS IS THE IMPORTANT PART SO PEOPLE QUIT ASKING
All of the encounters if done on normal first have a chance to drop the hard loot table items, excluding the abyss chest, deathsinger and thrallway chest. These can only be completed one time regardless of the level they are completed on. If you complete the entire raid on normal, you can still get literally every single item on the hard raid loot table. This being the primaries and crux. If you complete hard first, you will not be able to complete normal for any loot at any portion on normal. Completing hard first will exclude you from being able to receive any special or heavy weapons from crota. So if you still want a black hammer, hoc etc. then you cannot complete hard first. So the best thing to do if you still want heavy or special weapons is to find a crota checkpoint on normal and complete that before heading into the hard raid. Your best course of action for the rest of the raid is to complete it all on hard, and none of it on normal. Hopefully this does not just get ignored. If anyone is like me, they are surprised at just how frequently this is getting asked. Please feel free to respond with questions
EDIT: Please for the love of God, before you believe anything contrary to what I have wrote on this post, please use a little site called destinytracker to check the source. I have completed crota on normal around 50 times. I have completed crota on hard at least 12 times if you count the characters i deleted to make new hunters and a titan. I may not be the best at this game, but I can guarantee you I will never have my facts mixed up if I tell you i am sure. I am sure about where weapons drop. That much is literally elementary.
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Too many dumb people talking shit like: i got my black hammer from bridge.....