Commerci Bosses and drop rates?

But if it's just a "reactor", like gollux's heart chest. Then it all makes sense to me...

It's like a reactor, but it's not; it definitely is an invisible, invincible monster. You wouldn't be able to target it with skills if it was a reactor. What I mean is, say you were a Luminous in a map with a monster and a box, Reflection wouldn't bounce off the monster and hit the box, like it does with the invisible, invincible monsters on the ship.

Potentially, I would say it's possible that it's not affected by drop rate because it doesn't die "naturally", but rather because it's killed, perhaps "de-spawned", through some kind of script, I guess, upon the boss dying.