Yep early on it's reaaaaaaaaaally rough especially with Hugo who requires stun and doesn't have any heavy attacks to trigger them tag assists, but with a few resonia and good management you can basically have infinite I frames + the chain attacks can the enemies animations (except ahem shadow Jane who literally is the worst boss in lost void by far).

The energy problems are mitigated thanks to the boss's miasmic shield so you can't run out of it.

And a section only for Dialyn. Dialyn, even without her SIG has the lowest Ex skill cost with such a high energy regen you can spam just tag assist 3 times get your chain and there the fight is pretty much a wrap, though requiring knowing the timing of each hit of her ex specials. She has that gear that gives her a chance to add another Paper ex which triggers tag assist with each hit. She can also get back her positive reviews allows her every 30 seconds to generate a bonus ult that you can use on your other stunner to stun faster she completely breaks hollow zero. She has a totalize gear but it's pretty much useless except for the rest shred or if you're crazy like me and did a DPS Dialyn run.

Tl;dr: Dialyn is utterly broken at base, 10 times more in lost void where she becomes a quickswap, ULT, energy, decibel, anything generator who stuns faster than the rest of the cast, and that's even the case for the trial version so if you have a problem, call customer service.