I've been thinking about Absolute Regeneration, particularly how it affects the user. For starters, I think that Transmutation wouldn't work because your molecules will revert back to their previous state. Also, Regenerative Durability is a thing, where your regeneration enhances your durability. In my opinion, Absolute Regeneration should make you invulnerable either due to Adaptive Regeneration or your body getting stronger from the instantaneous recovery from injuries. Granted, realistically this will probably lead to Enhanced Body at best, but if we remove physical limitations, there is no plateau in sight for how powerful your body can become. Last but not least, pain. Since you regenerate infinitely fast, your wounds will have already perfectly healed before you start feeling the pain. Like Wolverine, you can get used to it, or go the Kaneki route where pain doesn't affect you at all.