grief

deep pain and sadness felt after a death or another serious loss

A cause or instance of sorrow or pain; that which afflicts or distresses; a trial.

Suffering, hardship.

(Internet) To deliberately harass and annoy or cause grief to other players of a game in order to interfere with their enjoyment of it; especially, to do this as one’s primary activity in the game, and especially by exploiting game mechanics without using cheats to do so, often through acts of destruction or vandalism.