Weaken Mind is an ability available to the Jedi Sage at level 16. It requires 17.5 force to cast, range of 30m and is instant cast. It deals damage over time (DOT). It is one of the primary abilities of a Jedi Sage who is specced into Telekentics.
It does 619 damage over 15 seconds at level 32, when the Jedi Sage is buffed with Force Valor.