No Heavy Core

Removes the heavy core from the loot pool, and replaces it with dirt.

Advanced configuration

You can edit the items dropped from the loot pool in the Trial Chambers in general with this datapack, simply unzip it and edit the .json for the loot pool you want to change. The loot pool responsible for the heavy core is

data\minecraft\loot_table\chests\trial_chambers\reward_ominous_unique.json

Edit the value(s) you want to change:

{"type": "minecraft:item", "name": "minecraft:dirt"}

becomes

{"type": "minecraft:item", "name": "minecraft:netherite_ingot"}