Stars' strange ability to 'warp time' isn't exactly as it seemed.
It's said that time seems to proceed differently around a blackhole due to the extreme amount of gravity. However it only it still only 'seemed' that way. For Stars' a similar approach was taken. Using magic and the power of the blackhole he was able to 'warp' how time progressed. This couldn't be fine tuned, and the rate constantly fluctuated. Additionally due to the large amount of energy such a process took it would rapidly drain anyone who remained in his special space.
However the two currently inside were far from normal. Mira's seemingly endless regeneration properties gave him an abnormal amount of vitality. No matter how hard he moved he never seemed to get tired. Givale was a Dragon, along with a special magic that was incredibly similar to his own features. Perhaps through this it gave her some resistance to the energy drain.
Pang~
