How many blocks does a Skeleton and Creeper need to fall to completely die? I've tried to do 24 blocks and it worked but it seems not necessary.
Minecraft: Fall Damage
minecraft-java-edition
Related Solutions
If you put a fence at the base of the fall, mobs will still take their regular falling damage. Due to the fence taking up 1.5 blocks of space (this is why you can't jump over fences), the mob will hit the fence instead of the water breaking the fall.
This mechanic can be applied like this (not my trap - it's part of a world I downloaded):
Mobs spawn in this gigantic tower...
...and hit these fences. The water then funnels the items into the middle (which then connects to another stream flowing the lava you can see, to kill any mobs that fell through the middle).
The 'wake up' mechanic was removed in Minecraft Release 1.0.
This answer is only relevant for versions of Minecraft built prior to that revision, accessible using the Minecraft Launcher's Time Machine functionality.
No, a creeper can not wake you up/be a nightmare.
The results would be catastrophic and are therefore disallowed just like a creeper mob spawner does not exist for the same reason.
bugi74 has done some great research on the code itself which verifies this:
On each try it will roll a random monster type from the subset of skeleton, spider or zombie
Best Answer
From the wiki
A skeleton has 10 hearts, as well as zombies and creepers, so the fatal fall distance is 23 blocks for them.