It is hard to hide these kinds of attacks, nor gathering evidence linking back to who caused the damage, we have experts all over the continent who can recognize that kind of tactic and find metaphysical traces of it, teleportation isn't "you can't see me (my time is now!)" field, it just means you have an escape option.
I'm also waiting for these kinds of attacks. I really hope the Deep Ones deliver since they happen to have wizards among their number. Even planeshift would work for this.
I'm sorry, but no. We can't detect someone who Teleported away. Let's say a Devil appears in an empty alley, casts some devastating SLA or drops wildfire, and then Teleports away. Nobody saw it, the Devil was Mind Blanked and under Alter Seld, and it's impossible to prove it wasn't an Efreet or something.
We can try to have that Detect Teleport enchantment placed in more important government institutions as a precaution, and we can hunt the Devil in question after the fact, but if one of our various enemies decided to throw caution to the wind and just be a terrorist it would be devastatingly effective because of how much time we'd end up sacrificing trying to counter it.
Then why haven't they done this? Other than random chaos and destruction not being a particularly Infernal MO.
For Devils, less profit this way. They move this openly and then they spawn an overly organized resistance against them from nearly everyone who witnesses it, rather than the current MO of the Imperium of just rooting out whatever cults they manage to find. Ironically they have more to gain by shrugging off their current losses and just slipping under the radar where they can. There are plenty of corruptible citizens to get to.
Uhm...
... That is a very good point, the Daemons would have been the ones I'd expect to do this the most.
Daemons naturally shift where there's enough misery. We simply can't have uprooted every cultist.
This draws back to the point that the world should simply be a playball of extraplanar powers, since even our meteoric ascent wasn't actually nearly fast enough to prevent all the potential cults and self-propagating Undead from taking over everything else.
I'm not disputing that daemons would be challenged, people generally don't want to be sacrificed to sanctify unholy monuments, just that daemons having to be called isn't all that much of a barrier. It's a constant thing of them slipping through the net and needing to be uprooted again and again. Human misery won't ever be eradicated even when we reach our peak.
You say that, but it's technically possible to make sure that everyone is constantly happy!
I think the problem is the sort of lesser daemons or demons who happen to slip through the cracks in the world are opportunists, not prepared saboteurs following a grand plan to destroy the Imperium in particular. So instead of deploying disposable weapons on strategic targets marked in advance by a non-existent Unified High Command, they'll just attack whoever happens to be around and eventually get killed by the local whoever.
If you use your flesh forges to keep a stable population, I'm all for it! (Asmodeus)
Thinking like a true Slaaneshi cultist.
That's not what I was saying, I was saying that cults of daemons is going to be a constant for us until the day we march on Abbadon. Yes the ones that slip through are mainly opportunistic, but part of that opportunism is building cults every time they get a chance.
That's perfectly fine, that's the reason the Inquisition exists. I'm only saying that it's going to occupy a lot of their time because it is by nature a constant thing, if not necessarily deserving of screenime at this point.
That sounds great though. Regular low-key