It actually has a few good uses you might over look. Garuda NM or and Garuda HM, use it each time she summons plumes, (they spawn under her during phase 1 except 1 set) If your group knows ahead of time, All of them can use AoE soon as you cast Tri-D, bind them in place, all their AoE hits. you now just lowered all the plumes down to 20% or less (dead in many cases) .. granted Garuda HM is a joke, but situations like that can actually be nice.

The spell overall is worthless, but it has its uses.