Confusion- you loose complete control over all your actions and random use or switching of weapons. if the attack goes through it can hit friend and foe if within range. can be caused by a wide range of opponents and maybe heavy weapons or charge attacks.
Possession- something or someone possesses your body. while possessed you seek out your allies in an attempt to kill them. while possessed your friends can also hurt you. depending on how much damage is taken by your allies or your enemies will reduce the time of the possession. can be caused by undead and undead themed weapons if the developers every decide to make any.
I thought these statuses would be an interesting addition to the game.
http://forums.spiralknights.com/en/node/41992 Please check this.