How can i make nuggets of Xp come out of my mob farm, like the one in MrBreadstones lets play?

[turbid atlas]

I've tryed to recreate the exact same mob farm, like in the lets play, but im not getting an nuggets of xp. im not using the exact same modpack, but i can look up nuggets of xp in the JEI mod so they are in the game, but i havent seen them naturally acure? Do i need some extra mod for them to get droped by mobs?

[rotund saddle]

you might need create enchantment industry