I found out that you can use Twilight Forest transformation powder to transform Twilight Wraiths into Blazes, which can then be killed for blaze rods(which I've been needing for a brewing stand, among many other things).
This was quite useful to me because I've had tough luck finding any blazes in the nether, and the item similar to blaze powder you get from those fire plants in the desert can't be combined to make the rods, so I needed blazes.
Good stuff.
Side note: You wouldn't believe the time I had trying to clear out a large Hollow Hill with stone swords and leather armor, dying over and over, then respawning in a little hut I built outside the hill. Must have spent 1 hour and a 1/2 on it. And on top of that, at some point an overworld creeper must have stumbled into my portal, so when I spawned in the TF he exploded and stranded me without a diamond to make a new one. As a result, I spent I don't know how much time gathering resources for IC2 machines and coal to macerate/compress to finally get a diamond from a coal chunk, seeing as how I couldn't find any in the world.......Sheesh.