Back when there was a day/night system planned that never happened, I suppose. There was an old mausoleum near the Graal City gate, too... but that was removed.
Day and night system + weather system= best looking graal server
Would really enhance the role-playing experience. Could use day-night system of Minecraft where different types of mobs come out only at night or already existing baddies, pirates, slimes etc. receive a stat boost and you could offer incentives for players to defeat more difficult enemies at night. It really all comes down to implementing these ideas and Classic Dev team in my opinion does not like to rush things.
Day and night system + weather system= best looking graal server
in all my years of playing Graal I have never seen a server pull this off and it look appealing. The effects built into Graal that handle light and shadows was horribly designed. The best way I've seen it done is with showpoly but I guess that method is pretty resource intensive. So I don't think it is viable for mobile.