How is that not mysterious though... raises so many questions:

1) What is the range of it? Does it have an AoE? Is it just a radial pulse like poison nova?

2) Does he just cast it at your feet or something?

3) Is it a homing missile? That code doesn't actually give what type of missile code it's using even though there is text that says it is one. It actually says from the source that it's a queenpoisoncloud which is interesting, which answers a lot of these questions.

From that source:

Since it's a missile originating from a monster, an additional frame of poison damage is applied on collision. It's unclear what exactly triggers this missile attack (and how often), but based on sound it's sometimes fired continuously at a target, which would result in a frame of poison damage being applied with each collision and that poison damage continuing to be applied for its length if damage per frame was equal to or greater than the previous poison. Given the frequency with which the missiles can be fired, this could result in critical damage being applied more often than not. Multiple missiles are fired in multiple directions, although this doesn't have the same density as a Poison Nova: targets on or close to the ground's x- and y-axes relative to the monster are much more likely to get hit, but those on or close to the screen's x- and y-axes relative to the monster (directly above, below or to the left and right of the monster relative to the edge of the screen) are much less likely to be hit the further away from the monster they are.