Prophesies

[overtyped]

Each day you get a prophesy from the gods, it may be good or bad, but it is something that will happen to you.
For example, "A day will come, a boar you'll see, his heart as black as the dreaded night" it could give a high chance of giving a dark heart when you kill a boar, until you get one, thus fulfilling the prophesy.
You would have a limit of some amount, maybe 7, and if you don't fulfill the prophesies, then you won't get any new ones, so it will curb alts a bit.

I thought it would give some incentive to log in, lots of games do stuff like this to keep people interested, because it's worthwhile.
Some others maybe.
" Soon A giant will be born upon the corpse of mother earth" It means soon you'll get jumped by a troll while mining, lol.
" a beast has stalked for many days, it's heart filled with desire, for a hearthling it will prey" A Bear spawns frequently until one of the spawns is killed"

[ven]

I thought it would give some incentive to log in, lots of games do stuff like this to keep people interested, because it's worthwhile.

Yeah, server events like that are a tested way to encourage activity.

This idea has appeared in many forms during the past 11 months. For example: viewtopic.php?f=48&t=50162&p=665163

[ekzarh]

In some games it is called daily quests. Which makes people log in and play.
And yeah - some prophesies have to be rare and rewarding to make players do even boring prophesies to free space