So, uh...
I picked up Trillion yesterday.
Oh god why did I pick up yet another min/max game? Oh yeah, IF, that's why.
I think it says something about my chances when I learned about one very specific facet of how to deal a very specific kind of damage to Trillion in the actual fight, rather than through all the mock battles (where it doesn't ever apply) and the one major sortie we had during the tutorial (I'm pretty sure he didn't have what was necessary to make that apply).
26 billion in the first fight is okay, but considering that's all of 2.6% of its health, well...
Also, Range Seal OP in the first stage, since if you move correctly, no mob should ever get an attack off before you smash their face with your 3 range. (And preferably eat them afterward for the passive buff to attack per kill you should probably have. [Not literally, this ain't DDS.])
After some work, I upped my damage output to 100 billion for the sortie. 10% is a marked improvement, but now I'm a bit scared as to what's going to happen after the next Trillion sortie, since my Overlord is guaranteed gone after that. I have no doubts that I'll be able to at least up that to 150 billion; my doubts go to what I'm going to do with her dying strike. Binding him is almost certainly not necessary - not when I can dodge relatively safely now, both direct damage and additional time are tempting. Then again, ghost partner and skill learn speed up are both great options too...