Netherdragon
The Dark Light
Actually, The revival needs the corpse to be idle first off, (so if it's continually attacked, the process won't start.) Second, it takes a while. For example, if she's by a volcano, it will take a day maybe two, if she's in the ocean, it might take a month or likely more. Additionally, the healing ability is affected by the heat in the area, so she heals faster when it's hotter out or when closer to a fire. But I never inteded it to be used in battle like this:...If she has healing abilities than I recommend it doesn't be used in battle, it like saying she immortal and it seems like this make her OP.. perhaps if she off the field she can recover slightly faster than the rest. How about that?
Character X cuts Diana's arm off
Diana activates her quirk and her arm regrows instantly
The arm would take a week at the very least (under very good conditions) to regrow and longer for her to readapt to using it.
Does that clarify things?
Also, the "Pheonix Blood" is the quirk the other powers I mentioned are meant to be biproducts if that makes sense