Global warming end. all weather is more extreme, chance for tornadoes and such to spawn, and everything is basically summer wasteland all the time it isn’t being a harsh blizzard or a monsoon downpour. Rivers and other bodies of water are bigger, or smaller, some only being river beds. Proper ‘nice’ days are so far and few between that they actually have a mood buff when they are seen.
Global cooling end. The world is seldom not a harsh blizzard, its almost exciting to see something OTHER than white and grey. Mass graves of terrified animals trampled and frozen to death can be found buried in a vertical columns of frozen flesh and shattered/splintered bone.
Realm end. The portals. Everyone still alive has a couple stories about the blasted things. Rumors exist of areas / “an area” that is not dominated by the nearest portal, places or locations rumored to be too far from its nearest realms to be affected by them. Most of us have begun to laugh at such notions, some areas just took longer for a portal to claim as their own. Most folk still alive have eked their existence out in The Borders. The edges. Where two realms considered less harsh fight for territory. Where when the monsters of one realm come retreat is possible into the other.