Hey, I'm planning an RPG campaign that revolves around the world ending. For this, I need sort of a doom clock/countdown timer type thing with several earth-shattering events that can shake things up in the game, kind of like we see in Mork Borg. Basically, as the campaign progresses, the doomsday clock will advance. Give me seven events that would dramatically shape the game world, starting from somewhat subtle and becoming more dramatic with each stage. The final event should bring about the end of the world somehow. Make each of them super metal in terms of tone.
Okay, can do that! Here are seven world-changing events ranging from subtle to earthshattering:

1. People everywhere start having nightmares about a skull in the sky. This acts as a warning to the players that the end of the world is coming.
2. Several plagues sweep the land, including diseases, locusts, frogs, etc. This can shake things up for the party by upending the status quo in the game world.
3. Storms of oddly-colored lightning roll in from the ocean with thunderclaps that sound like legions of screams. This creates a doomsday atmosphere that can also complicate adventuring in certain areas.
4. Earthquakes open rifts in the ground in various places, spewing monsters out into the land. More monsters mean more danger.
5. The moon cracks open, revealing the image of a skull underneath its surface. Every night, the skull laughs audibly for all to hear, creating a sense of foreboding while shaking things up.
6. The sun melts from the sky, plunging the world into an eternal night. This puts pressure on the players by giving them a strict time limit before everything ends.
7. A great being from beyond the stars arrives to swallow the world. This could serve as an interesting final boss fight, but either way, the campaign is likely to end here.

Are those ideas metal enough for you? Let me know if you need more inspiration or details!