Terraria – My steampunker won’t spawn even with all of the requirements fulfilled

(The following info pertains to the PC version, though it may also pertain to the console version as well.)

The Warrior Emblem, Avenger Emblem, and Destroyer Emblem absolutely stack (quote taken from the Destroyer Emblem wiki page):

Note that the Destroyer Emblem, Avenger Emblem, and Warrior/Ranger/Sorcerer Emblem all can be equipped simultaneously for a stacking damage bonus.

These also stack with the fire gauntlet and mechanical glove. However, consider using the Celestial Stone in place of the mechanical glove, as several of the end-game class setups for melee builds use this accessory combination for maximum damage.

By the way, if you get the Menacing modifier on each accessory, it's an additional 4% damage per item! Combined with a Terra-Blade, you can rack up some ridiculous damage per hit.

It is indeed possible to summon the Goblin Army using the battle stand, although there are a few notes that should be taken:

• A Goblin Army (and all later invasions) spawn around the center of the map, with the exception of the first wave, which will come from east or west. This will be announced through the message : "A Goblin army is approaching from the east/west!".

• After the first wave reaches the center of the map, all future waves will spawn around the center of the map.

• The amount of Goblins that will spawn is 80+40 for each player in the world.

• You cannot summon a Goblin Invasion if:

  • You have less than 200 health.
  • You haven't smashed any Shadow Orbs/Crimson hearts yet.
  • If there is another invasion going on.