RE: Warpstone
We probably should think about it in terms of quantity, because larger amounts of Warpstone OR high ambient Dhar alters physics in significant ways.
-Very Low density(Warpstone particulates in isolation in a non-Dhar rich environment)
Based on known behaviours, this should have the warpstone particles sublimate over time to become ambient Dhar. If there are functional leylines, this ambient Dhar is drawn away, if theres no functional leylines, the Dhar would tend to pool in dark places - we've already established this, Dhar attracts all the Winds after all, including itself, but at this density its not going to be able to overcome the Winds natural repulsion, and may be even naturally dispersed by sufficiently potent ambient Hysh or Ghyran.
-Low density(Warpstone pebbles in isolation)
This should be broadly speaking, stable. Some of it will sublimate, but the sublimated Dhar will be drawn towards the nearest large body of Dhar(the warpstone) and promptly redeposit itself. Its not large enough to capture significant amounts of the Winds, there would be absolutely glacial growth, if any. So it depends on the ambient environment. If its consistently Dhar free, then it'd slowly shrink over time.
-Moderate density(Dhar rich environment, or large quantities of warpstone particulates[which shortly after becomes a Dhar rich environment anyway])
At this point its going to be able to start capturing ambient winds to form more Dhar, and warpstone is going to be deposited absolutely everywhere, you aren't going to get rid of this from passive environmental action here, theres enough of it to start forming effects like spontaneously rising undead, mutating plants and animals, etc. If you have waystones near enough then it'd peel off the ambient miasma(which means allowing for natural dispersal over time again), but if they fall, the warpstone embedded in so much of the environment WILL restore its state in fairly short order.
-High density(Either warpstone meteors, significant warpstone deposits or its Chaos Wind/Moon season again)
Mostly what examples we have of this is MOSTLY stable-ish. After a certain point additional Dhar seems to go tend to into corrupting the environment rather than spreading wider. So you get a spot of Very Corrupted Shit, and it WILL actively fight you if you try to change that.
-Very high density(you have bigger problems than Warpstone, or you're in the Chaos Wastes)
You have bigger problems than long term warpstone pollution at this point, deal with those problems first. Or flee.
And something that isn't even slightly adapted is the stylites - the anchorites on top of a pole. Sitting up there and doing nothing except presumably thinking holy thoughts makes some kind of sense in a theology where all of the reasons why doing so sucks are actually the evil physical world lying to you. It doesn't make any kind of sense if your religion is about the life and legacy of Hammer Guy.
TBH it makes perfect sense…if they were wizards instead, because sitting at the top of a pole doing nothing but thinking holy thoughts would actually lend useful assistance towards getting in touch with Azyr and Hysh.