Nexo

When Nexo is installed, two triggers for custom items become available. Detection is automatic.

Trigger	Counts when the player...	Progress
nexo_craft_item	crafts a Nexo item	1 per craft
nexo_smelt_item	takes a Nexo item out of a furnace	amount smelted

The vanilla craft_item and smelt_item triggers only understand vanilla materials — these two match on the Nexo item ID instead, so you can build quests around your custom item tiers.

nexo_craft_item

The target is the Nexo item ID and it's required — there's no any (for "craft anything" quests use the vanilla craft_item trigger with the item's base material):

objectives:
  forge_blade:
    name: "&#FF6B6B&lForge the Ember Blade"
    description:
      - "&#C7D0D9Craft an ember blade at"
      - "&#C7D0D9the workbench."
    trigger: nexo_craft_item
    target: ember_blade
    required: 1

nexo_smelt_item

Fires when the smelted result is taken out of the furnace. The target is a Nexo item ID or any, and progress counts the full amount extracted:

objectives:
  smelt_ore:
    name: "&#FFD86E&lMythril Smelter"
    trigger: nexo_smelt_item
    target: mythril_ingot
    required: 16

Item IDs are the keys from your Nexo item configs (ember_blade, not &cEmber Blade). A typo means the objective silently never progresses, so test new quests with /quests force give before putting them on the board.