This seems like a dangerous world, I saw players getting 'killed'. In what ways can other players hurt one another? 

Death is not final in MD (still a bit of a nuisance).

But there are many other ways players can hurt each other: nasty spells, nasty combat rituals, event sabotage, alliance sabotage, friend betrayal and so on and so forth.

Most of these are "allowed" in MD, but beware of the consequences!

They are part of the experience and generally make people react or adapt.

Either way you grow, you learn. After all, nothing is irreversible.

 

For serious crimes / harm: there's also a MD court with judges.

If you're unsure whether a certain behavior is permitted read "Rules and Restrictions".

and there is skilldamage that basically reverts your efforts of gaining more stats, or bad trades that are legal, or mentally deranged 'friends' that intoxicate your life, and s on.... its a jungle, run while you still can!!!!