Oh, that’s a neat idea. I’d made a Druid way back when (http://crowbarandbrick.blogspot.com/2013/10/the-druid-acks-class.html) and had just noted the druid would resist efforts to change the domain from wilderness, and gave them some hijink ability to support that.
Actively populating the hex with druidy sorts of monsters to keep the domain from graduating to borderlands, that’s ridiculously fun. Hell, reducing a stronghold to rubble and driving out the peasantry so you can install a centaur lair in the ruins, that’s glorious right there.
You’re unsecuring the domain, essentially. Alex gives some guidance to lairs-per-hex here:
http://www.autarch.co/forums/ask-autarchs/securing-domains
As to what the Druid could get out of it, perhaps that can vary by monster treasure type? Incidental may flow up to the druid as it’s collected (the druid picks out an interesting sword left in the hippogriff nest); hoarders would give up some percentage as income (the local dryad hands of a pretty gem whenever she next sees the druid) I’d have to look at who has Raider treasure to see how many aren’t druid-compatible.
It’d probably be keyed off of wandering monster tables indicating some adventuring party just got owlbear’d or an off-course merchant caravan tried to make firewood out of a treant, so it wouldn’t be steady income.
Tie that back into divine/ovatic power gain for magical resource so that the druid doesn’t have to harvest her lairs.
Hm. There’s some interesting reverse-dungeon themes in there. I could see a whole subsystem to support the solo play of a druid reclaiming wildlands from the gauntleted grip of civilization.