Platinum Staff

Platinum Staff is a summoning weapon, crafted with 9 platinum bars and 2 rubies at an anvil.

It summons a Platinum drone, can be summoned in seemingly infinite numbers.

Even though the staff can summon a lot of them, a lot of them are restricted through terraria's entity limit and will at some point stop spawning.

The Platinum drone breaks after hitting the enemy a few times.

While the tooltip says it doesn't consume minion slots, it will still steal 1 minion slot even if you can spawn much more than that.