Yesterday I fought a full phase bounty fleet, 5 Dooms, 4 Harbingers, Afflictor and Centurion. Granted all ships had lvl 7 officers and 2 s-mods. It was downright disgusting, the whole screen was just mines and additional missiles fired by Dooms. My Invictus went down from full 40k hp to 130... They murdered every smaller than capital ship that I had, and capitals were barely alive at the end.
Which is kinda the stupid thing with phase ships, without proper investment they're a joke, and with everything they need they become monsters. I'm not a fan of them generally, so I only tried a couple back when the skill system got reworked, and they're useless without the Technology phase skill, Doom is especially super slow. I feel like you either min max the benefits from the skill or don't bother with phase ships in your fleet. You could run a Gremlin for the lulz now that it has Rugged Construction.