What is an uncraftable potion?
I'm trying to make a Holy Hand Grenade type of splash potion which has instant harming 4. I have
give @s minecraft:splash_potion{CustomPotionEffects:{id:7,Amplifier:3,ShowParticles:0},Enchantments:[{id:"minecraft:multishot",lvl:1}],display:{Name:"{"text":"Holy Hand Grenade of Antioch","colour":"gold"}"}} 2and I followed the wiki in adding the tags, but for some reason it doesn't even have any harm, it only has an uncraftable potion.
A) What am I doing wrong to not get the harming effect at all?
B) Is it possible to get harming 4? If it is, how can I?
Regarding the uncraftable potion -
The CustomPotionEffects is a list, so everything in it has to be put into square brackets ([]).
And for some reason custom potion effects, as the only place in the game, require "Id" with a capital "I/i". Note that the non-capital "id" is indeed correct for the enchantments.
Putting these two corrections together, the correct command should be:
give @s minecraft:splash_potion{CustomPotionEffects:[{Id:7,Amplifier:3,ShowParticles:0}],Enchantments:[{id:"minecraft:multishot",lvl:1}],display:{Name:"{"text":"Holy Hand Grenade of Antioch","colour":"gold"}"}} 2Source: I always start at "chunk format" as the central hub for everything, because I'm lazy, which directs me to "Player.dat#Item structure", specifically to Potion effects (archive).