I ended up hitting a flying enemy with the skill skepticism (paranormal investigator skill tree) while they were over an eruptor trap (rusty caltrops eruptor i think) and they turned into a ground dwelling monster which triggered the trap. The trap kept being triggered and the monster kept changing into different monsters. After a few seconds of monster switches and traps erupting it stopped, leaving stacks of traps in the usual 3x3 eruptor pattern (the missing row is from monsters stepping on the traps). If a monster steps on one of the trap stacks the traps in the stack all go off at once leaving behind nothing but if you disarm a trap in a trap stack it just uncovers another trap. I'm not quite sure if this would be a bug or not but it would be definitely exploitable. Included is a picture of some trap stacks, notice the number of shiny particles (denoting the many traps on each tile)
I dunno, that basically sounds pretty damned awesome to me. I have no idea how to replicate it either, but I guess we'll take a look...?
I like this one! I'm pulling off a less awesome version though: If I transform a flying monster even into another flying monster over the trap, the trap effects take hold, and as it's level 1, the enemy usually ends up dead. ...Well, it's actually still alive, with 0 HP, red "It is dead." text in the description, and outputs no damage, still attacking on turns with neither the player or message log reacting to this action. So that's fun. EDIT: With Rusty Caltrops (NOT the eruptor), the same thing happens, but the trap stays in place. Quizzical!
As far as replication goes all you would need to do is cast skepticism on a flying enemy while they are above an eruptor trap. If it works you should see multiple eruptions and monster switches, resulting in a large number of traps being produced.
Independently confirmed. I almost want to turn this into a strategy, but it's a bit hard to consistently set up.
