I wasn't even talking about turrets there, but I already addressed alternate options to the "immunity to some type of damage" (which incidentally is also very different from "immune to everything") in a previous reply:
Exploiting LOS to take down a turret that otherwise would shoot you down at the fantasy equivalent of a gatling's rate of fire does NOT count as a legitimate combat option, though.
Disabling one layer of immunity in some way or forcing them to target some sort of bait and then destroying them once and for all would, on the other hand.
And this is always assuming that "it's not supposed to be a combat scenario", which is the (legitimate?) claim made by many in this very thread.
If it's meant to turn into one at player's desire, on the other hand, it also needs to be better as a combat scenario, as the OP is suggesting.
