What Minecraft resources are impossible or difficult to obtain in peaceful?

I'm trying to find a definitive list of resources (from both the overworld and nether), that are 100% impossible to obtain in peaceful mode in a vanilla survival game without using any cheats.

Furthermore, what resources become (very) difficult but not impossible to obtain in this situation?

2

2 Answers

Since the only items impossible to obtain in peaceful are mob drops (that are not obtained otherwise) and derivatives, here's a list of unobtainable items:

• Blaze rod
• Music discs (with the exception of music discs "13" and "cat")
• Ender pearls (even though you can obtain an eye of ender by trading)
• Spider eye
• Ghast tear
• Slimeballs
• Magma cream
• Nether star
• Wither skeleton skull

There are only a handful of direct derivatives:

• Brewing stand (requires Blaze Rod)
  • This leads to no potions as well, especially those that use a Fermented Spider Eye, Ghast Tear, Blaze Powder, or Magma Cream
• Sticky Piston (requires Slimeball)
• Beacon (requires Nether Star)
• The Wither (requires 3 Wither Skeleton Skulls, but you're not going to spawn that on peaceful anyway)
• Fire Charge (requires Blaze Powder)
  • Also limits available Fireworks

And here is the list of drops you can still obtain:

• Bone (can be found in temple and dungeon chests)
• Rotten flesh (before snapshot 12w22a could be traded with villagers but can also be found in temple and dungeon chests)
• Strings (obtained by: destroying cobwebs and tripwires and it has 53% chance of spawning in a dungeon chest)
• Arrows (can be crafted with other resources available in peaceful, can be found in temples and can be traded with villagers)
• Gunpowder (will be possible to loot in dungeon chests)
• Gold nuggets (can be obtained by placing a gold ingot into a crafting area)
• Dragon egg (reaching the end is possible by trading eyes of ender with villagers; apparently the ender dragon won't despawn on peaceful and the creation of a piston is still possible)
• Glowstone dust (can be obviously obtained in the nether and by trading with villagers)

It is also to note that a lot of items, that are possible to obtain, won't be renewable anymore, like:

• Bone (previously farmed by killing skeletons or wither skeletons)
• Coal (not charcoal, previously farmed by killing the wither skeleton)
• Gunpowder (previously farmed by killing creepers, ghasts or witches)
• Strings (previously farmed by killing spiders and cave spiders)

6

The things I think of immediately:

• ghast tears
• blaze rods
• wither skeleton skulls
• ender pearls
• spider eyes
• slimeballs
• magma cream

Other mob drops are craftable/findable in dungeon chests. Carrots and potatoes will require you to find a village that has some planted.

3