public class CopperHelmetItem extends ArmorItem {
    public CopperHelmetItem(ArmorMaterial material, EquipmentSlot slot, Properties properties) {
        super(material, slot, properties);
    }


    @Override
    public void onArmorTick(ItemStack stack, Level world, Player player) {
        if (!world.isClientSide()){
            
        }
    }

I would like to make an amor piece that summons lightning on the player when wearing it. I can't seem to find a method for spawning an entity in 1.18.1... 

create a new instance of the Entity you want to spawn,
modify the Entity (set Position, ...), call Level#addFreshEntity to add the Entity to the Level

Thanks!
Could you show me how to create a new instance of the entity? That would be really helpful!

22 minutes ago, Losokos said:

Could you show me how to create a new instance of the entity?

that's basic Java, if you don't know how to create a new instance of an Object learn Java first bevor modding Minecraft

Its my school project, haha... I didin't choose it, but i guess you are right.