As it makes the empty run away, it can be useful in the final bcnm in Promyvion-Vahzl, when the link occurs.
It can save time in desperate cases, like letting the mages rest, or waiting for next smn 2hrs during boss, when there is no other animas active.
The Terroanima is more of an 'emergency item' for Promyvion boss fights. Where Hysteroanima or Psychoanima can make or break a fight, Terroanima is more for helping out if things go wrong.