K sorry for delay, i couldnt think of anything =/
Hopefully its not too easy.
It is not physical, yet it can be seen, heard, and felt.
Sometimes it is by accident, sometimes through striving.
It is obvious when it is present, or not present.
it is fleeting for some, for others it can not be taken away.
It can not be given away, but it can be multiplied.
No.
If it's too hard i suppose i could give hints. but keep guessing first
It is usually accompanied by bounties, or achievements. But sometimes for no apparent reason.
Every one seeks it. You can be glad someone else has it, or you can be jealous.
It can change someones behavior.