Great idea! Wish I had thought of it...

I was also thinking that, with seasons now in, certain mobs would expand their "territory"

Like maybe a yeti (if those even exist) would occasionally wander off the mountains during winter.

OR....

You could make seasonal perms. Ones that maybe drop quest items or just have awsome stuff. This would also kind of tie into the idea of blocked passages.

So during winter the "yeti" would come from hiding and be made available to players to kill. But only during winter.

Maybe a water dragon or Asmodus (lol at me for reading redwall series) the snake would be made available during raining seasons.

Or a colossal sand giant during the hot summer times might be found in the deserts.

Fall I dunno... thats up to the more creative minds. Maybe a wood spirit of some sort? Dunno....

Anyway... These season specific perms or mobs would carry cool stuff. Good for economy and good for players!

Just some fun calander oriented stuff I was thinken about.