A splash potion of weakness in Minecraft can be used to knock down either a mob or other player’s damage for a significant amount of time. To get ahold of this useful defensive item in survival mode, you will need to brew it.
The items needed are:
- a brewing stand
- blaze powder
- water bottles
- a fermented spider eye
First, you need to make a potion of weakness. To do this, find a spider in the world and kill it to get a spider eye. To make it a fermented spider eye, you will need a brown mushroom and sugar and put the three together at a crafting table.
At the brewing stand, put blaze powder in the slot on the far left, your water bottles in the three bottom slots, and the fermented spider eye in the slot above the water bottles. This will brew a normal potion of weakness, but it can only be consumed, not thrown.
Now that you have your potion of weakness, you need gunpowder. The easiest way to get this is to kill a creeper without blowing it up. Head back to the brewing stand and activate it with another blaze powder on the far left. Put the potion of weakness in the bottom slots and the gunpowder in the top slot to brew the splash potion of weakness.
Now the potion can be thrown and whoever is in the splash radius will have the weakness status effect which will lower their attack damage for more than a minute.